Round Bar

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Koj tus thawj coj Sino Special Metal Supplier
 

Sino Tshwj Xeeb Hlau (SSM) yog cov chaw tsim khoom muaj npe nrov thiab muaj npe nrov, distributor, thiab stockist ntawm ntau yam khoom lag luam, suav nrog Cov Yeeb Nkab, Yeeb Nkab Fittings, Flanges, Bolts, Round Bar, Hlau Phaj, Vuam Hlau, Hlau Prefabrication, thiab lwm yam. . Nrog rau ntau tshaj 30 xyoo ntawm kev paub nyob rau hauv tshwj xeeb hlau cov khoom tsim, tsim, thiab kev lag luam, SSM tau tsim nws tus kheej ua ib tug thawj coj ntawm kev sib txuas piping kev daws teeb meem rau ntau yam kev lag luam thoob ntiaj teb.

 

Peb muaj peev xwm tsim cov khoom lag luam hauv ntau cov khoom siv qib, xws li Hastelloy, Inconel, Incoloy, Monel, Duplex stainless hlau, Stainless hlau, Alloy steel, Carbon steel, Titanium, thiab ntau ntxiv. Cov khoom siv sib txawv no tso cai rau peb ua raws li cov kev xav tau tshwj xeeb ntawm ntau yam kev lag luam. Nrog rau qhov khoom siv dav dav no, SSM tau nruab los muab cov kev daws teeb meem sib xyaw ua ke uas ua tau raws li qhov tshwj xeeb ntawm peb cov neeg siv khoom.

 

 
Vim li cas thiaj xaiv peb?
 

 

Tus nqi sib tw

Peb muaj ib pab neeg ntawm cov kws tshaj lij uas tau cog lus tias yuav xa cov kev pabcuam sai, vam khom ntawm tus nqi tsim nyog, kom ntseeg tau tias peb cov neeg tau txais txiaj ntsig zoo tshaj plaws rau lawv cov peev txheej.

Kev tswj kom zoo

Peb cov khoom yog tsim los siv cov ntaub ntawv zoo tshaj plaws thiab raug rau cov kev tswj xyuas nruj, kom ntseeg tau tias peb cov neeg tau txais cov khoom zoo tshaj plaws muaj nyob hauv khw.

Kev paub nplua nuj

Peb pab pawg engineers thiab cov kws tshaj lij muaj ntau xyoo dhau los hauv kev lag luam, thiab peb siv cov kev txawj ntse los muab peb cov neeg siv khoom nrog cov kev daws teeb meem zoo tshaj plaws.

Siab zoo

Peb tsuas yog siv cov ntaub ntawv qib siab tshaj plaws thiab cov txheej txheem tsim khoom siab tshaj plaws los tsim cov khoom lag luam uas txhim khu kev qha, ruaj khov, thiab ua tau raws li cov qauv siab tshaj plaws.

Tsev 123 Rau sab kawg 1/3
 
Round Bar yog dab tsi?
 

Round bar yog qhov ntev, cylindrical hlau bar Tshuag nrog ntau cov kev lag luam thiab kev lag luam, ib qho ntawm feem ntau yog shafts.

 

Cov txiaj ntsig ntawm Round Bar
01/

Siab zog
Lub siab carbon steel puag ncig bar muaj qhov siab melting point ntawm 1425 thiab 1540 degree. Nws nyob ze tsis muaj kev puas tsuaj, tshwj xeeb tshaj yog nyob rau hauv qhov kub thiab txias ib puag ncig. Piv txwv li, thaum siv los ua ib feem ntawm lub tsheb thauj neeg lub tsheb ncua kev kawm ntawv thiab cov ncej, cov pa roj carbon ntau puag ncig muaj kev vam khom. Qhov no yog vim hais tias lawv muaj peev xwm txhawb nqa tau zoo txawm tias thaum raug tshav kub ntau npaum li cas los ntawm cov txheej txheem combustion.
Round bars kuj tseem pom muaj nyob rau hauv kev tsim kho, qhov twg lawv siv rau lawv cov peev xwm thauj khoom - xav tias lub ru tsev decking, trusses, phab ntsa studs, scaffolding, concreting, vuam, thiab ntau ntxiv.

02/

Los ntawm cov duab sib txawv
Thaum muaj cov qauv ntau thiab tsawg rau puag ncig, lawv tuaj yeem tsim nyob rau hauv cov duab sib txawv thiab qhov ntau thiab tsawg uas haum rau cov neeg siv khoom nyiam. Lub puag ncig bar kuj tseem tuaj yeem coj cov duab ntawm lub puck lossis ib lub pas hlau me me uas muaj qhov me me hla ntu.Lwm cov qauv tsim kuj tseem tuaj yeem nqa tawm ntawm qhov puag ncig. Thaum txias-tsim, piv txwv li, qis sab hauv kev ntxhov siab teeb tsa cov xwm txheej zoo tshaj plaws rau lub voj voog puag ncig kom dhau mus txiav thiab fabrication. Lub round bar tuaj yeem txiav, sheared, los yog stamped nyob rau hauv thiaj li yuav sib xws nrog lwm yam fittings, couplings, hlau connectors, thiab lwm yam.
Vim muaj qhov sib txawv ntawm qhov sib txawv rau lub voj voog puag ncig, kev lag luam tuaj yeem siv tau raws li lawv pom zoo, thiab ua kom zoo dua ntawm kev kho qis uas yuav tsum tau ua rau cov kab puag ncig.

03/

Malleable
Qhov ntawd tuaj yeem siv rau lub voj voog puag ncig yog tooj liab, tin, thiab bronze. Cov ntaub ntawv no yog yooj yim malleable, cia fabricators thiab manufacturers los manipulate lawv yooj yim.Round tuav tsis tshua xav tau cov khoom kim heev los tsim, tsis zoo li stamped qhov chaw uas yuav tsum tau mus los ntawm xovxwm so los yog txawm CNC machinery. Hloov chaw, cov txheej txheem tsim khoom yooj yim xws li milling, sib tsoo, thiab casting yog siv nyob rau hauv round bar ntau lawm.
Kev tsim khoom qis qis ua rau lub voj voog puag ncig tau yooj yim thiab txo cov nqi nyiaj siv ua haujlwm rau kev tsim tsheb, kev tsim kho, petrochemical refinement, thiab ntau ntxiv.

04/

Zoo heev nto finish
Lub round bar tseem tuaj yeem ua si qhov zoo tshaj plaws nto tiav los ntawm kev ua tiav cov txheej txheem hlau. Plating, piv txwv li, tuaj yeem txhim kho cov luster ntawm cov khoom lag luam hlau puag ncig los ntawm kev ntxiv lwm txheej ntawm zinc, chromium, cadmium, lossis npib tsib xee. Thaum txhuam thiab tu yooj yim tuaj yeem tshem tawm qhov tsis xws luag hauv qhov chaw lossis qhov tsis zoo ntawm qhov puag ncig los tsim kom muaj lub cev du thiab zoo ib yam.

 

 

Hom Round Bar

ASME SB564 ASTM B564 Nickel 200 1/2″ To 48″ Spectacle Blind

Me me steel round bar

Ua los ntawm cov hlau me me, qhov puag ncig bar no muaj qhov zoo malleability thiab siab tensile lub zog

Nickel 200 Socket Welding ASME SB564 ASTM B564 SWRF Flange

Tool steel round bar

Paub txog nws hardness thiab tsis kam hnav thiab tsim kua muag ua rau nws zoo kawg nkaus haum rau kev siv hauv machining thiab cov cuab yeej ua.

Raised Face RF Anchor Flange (Nickel 200)

Stainless hlau round bar

Round tuav ua los ntawm stainless-steel showcase zoo heev xeb kuj thiab durability.

 

 
Daim Ntawv Thov Thiab Kev Siv Round Bars
 

 

1

Yog vim li cas tsom xam:Lub tsheb thav duab thiab chassis yog tam sim no tau ua nrog ntau hom kab puag ncig.

 

2

Yog vim li cas tsom xam:Round Bars yog siv nyob rau hauv kev tsim cov trellis thiab laj kab los yog ntsia.

 

3

Yog vim li cas tsom xam:Steel Round Bars feem ntau siv rau hauv kev tsim kho thiab engineering tej yaam num.

 

4

Yog vim li cas tsom xam:Round tuav yog nyob rau hauv kev xav tau ntau yam ntawm cov khoom fastener xws li bolts, ceev, screws, washers, thiab rivets.

 

5

Yog vim li cas tsom xam:SS Round Bars siv hauv Kev Lag Luam Roj thiab Roj.

 

6

Yog vim li cas tsom xam:Round Bars siv hauv Cov kav dej.

 

7

Yog vim li cas tsom xam:Steel Round Bars siv nyob rau hauv cov khoom siv dej.

 

8

Yog vim li cas tsom xam:Stainless Round Bars siv nyob rau hauv Fais Fab Kev Lag Luam.

 

 
Txheej txheem ntawm Stainless Hlau Round Bars
 

 

 
Kev xaiv khoom

Thawj kauj ruam yog xaiv cov khoom siv raw uas tsim nyog. Hom stainless hlau siv yog nyob ntawm daim ntawv thov tshwj xeeb, thiab cov yam ntxwv xws li kev tiv thaiv corrosion, lub zog, thiab kav ntev yog muab rau hauv kev txiav txim siab.

 
Melting

Cov khoom siv raw uas tau xaiv yog yaj hauv lub cub tawg, qhov chaw uas lawv tau rhuab mus rau qhov kub siab kom txog thaum lawv ua molten. Tom qab ntawd cov hlau molten yog poured rau hauv pwm los ua ib tug billet.

 
Kub dov

Lub billet yog ces rhuab mus rau ib tug kub siab tshaj nws recrystallization kub thiab dhau los ntawm ib tug series ntawm rollers los ua ib tug ntev, nyias bar. Cov txheej txheem no yog hu ua kub dov, thiab nws tshwm sim nyob rau hauv ib puag ncig bar nrog ib tug ntxhib nto.

 
Annealing

Tom qab kub dov, lub round bar yog annealed, uas muaj cua sov nws mus rau ib tug kub kub thiab maj mam txias nws. Cov txheej txheem no txo ​​cov kev ntxhov siab hauv cov hlau thiab txhim kho nws cov ductility thiab toughness.

 
Txias daim duab

Lub annealed round bar yog ces txias los ntawm ib tug series ntawm tuag kom ua tau raws li qhov xav tau cov duab thiab loj. Cov txheej txheem no ua rau lub ntsej muag du thiab txhim kho qhov tseeb qhov tseeb ntawm qhov bar.

 
Ua tiav

Cov kab tiav tiav yog polished, txiav mus rau qhov ntev uas xav tau, thiab tshuaj xyuas qhov tsis xws luag xws li tawg, voids, lossis deg imperfections.

 
Ntim

Cov kauj ruam kawg hauv cov txheej txheem tsim khoom yog ntim cov kab tiav tiav rau kev xa mus rau cov neeg siv khoom.

 

 

Hom Qib
 

Hlau alloy

Alloy steel round bars muaj nyob rau hauv kub dov los yog txias dov. Alloy steels yog ua los ntawm hlau, carbon thiab lwm yam khoom xws li vanadium, silicon, nickel, manganese, tooj liab thiab chromium.

Cov pa roj carbon steel

Peb muaj Carbon steel yog ib hom hlau tshwj xeeb uas, raws li lub npe qhia, muaj cov pa roj carbon ntau dua li lwm hom hlau. Cov hlau feem ntau muaj cov ntsiab lus qis qis ntawm {{0}}.05% txog 0.3%. Hauv kev sib piv, carbon steel muaj cov ntsiab lus carbon txog li 2.5%.

Stainless hlau

Stainless hlau round bars yog heev corrosion resistant. Cov hlau tsis muaj hlau yuav zam tau cov kua qaub ntau thiab tuaj yeem siv rau hauv cov tshuaj chlorine bearing ib puag ncig lossis alkaline daws.

Aluminium puag ncig

Aluminium puag ncig tuav muaj lub teeb yuag thiab muaj zog corrosion kuj, thaum ua tau yooj yim rau tshuab thiab txiav. Kev siv ntau ntawm aluminium round bar muaj xws li kev txhawb nqa, luas, ncej, braces, pins, thiab dowels.

Brass round

Brass round tuav yog siv thaum lub zog, hluav taws xob conductivity, corrosion resistance, thiab spark kuj tseem ceeb. Brass yog ib qho yooj yim rau tshuab thiab muaj qhov ntxim nyiam sheen thaum polished. Qee qhov piv txwv ntawm kev siv tooj dag bar yog Precision tig Cheebtsam, fasteners thiab fittings.

Tooj liab

Peb siv round bar ntawm tooj liab. Copper yog cov khoom siv tshuaj nrog lub cim Cu. Nws yog ib qho mos mos, malleable, thiab ductile hlau nrog siab thermal thiab hluav taws xob conductivity. Peb muaj ntau qib ntawm tooj liab. Lub ntsej muag tshiab ntawm cov tooj liab ntshiab muaj xim pinkish-txiv kab ntxwv.

 

Qhov txawv ntawm Round Bar thiab Steel Bar yog dab tsi?

 

Cov ntsiab lus "steel bar" thiab "round bar" feem ntau siv sib hloov, tab sis lawv tuaj yeem muaj lub ntsiab lus txawv me ntsis nyob ntawm cov ntsiab lus.

 

 

 

Hlau bar

Feem ntau, lo lus "steel bar" yog hais txog ib qho ntev, cov khoom ntawm cov hlau uas yog tsim nyob rau hauv ntau yam duab, qhov ntau thiab tsawg, thiab qib rau kev siv sib txawv. Cov hlau tuav tuaj yeem ua tau tiaj tus, square, duab plaub, lossis puag ncig hauv ntu ntu, thiab lawv tuaj yeem ua los ntawm ntau hom hlau, xws li carbon steel, stainless hlau, lossis hlau alloy. Cov hlau tuav yog feem ntau siv hauv kev tsim kho, tsim khoom, tsheb, thiab lwm yam kev lag luam rau kev txhawb nqa, kev txhawb zog, machining, thiab fabrication lub hom phiaj.

When Did They Stop Using Steel Pipes?

 

 

Round bar

Ib puag ncig bar, raws li lub npe qhia, yog ib hom steel bar uas muaj ib ncig hla ntu. Nws kuj yog feem ntau hu ua "round rod" los yog "khoom khov" thiab yog ib qho ntawm cov duab zoo tshaj plaws ntawm cov hlau tuav. Round bars muaj nyob rau hauv ntau txoj kab uas hla, feem ntau yog li ntawm ob peb millimeters mus rau ob peb nti lossis ntau dua, thiab lawv tuaj yeem tsim los ntawm ntau hom hlau, xws li carbon steel, stainless hlau, lossis hlau alloy. Round bars yog dav siv nyob rau hauv ntau daim ntawv thov, xws li shafts, axles, pins, fasteners, thiab cov khoom nyob rau hauv machinery, kev tsim kho, thiab lwm yam lag luam.

How to distinguish between good and bad quality in galvanized pipes?

Yog li, thaum "steel bar" yog ib lub ntsiab lus dav dav uas suav nrog ntau yam duab thiab hom steel tuav, "round bar" tshwj xeeb yog hais txog lub steel bar nrog ib ncig hla ntu. Lwm cov duab ntawm steel tuav muaj xws li cov tiaj tiaj tiaj, square bar, thiab cov kab plaub, txhua tus muaj lawv tus kheej cov yam ntxwv thiab kev siv.

 

 
Peb lub Hoobkas
 

 

 

 
FAQ
 
 

Q: Dab tsi yog round bar siv rau?

A: Plain Round Bars Daim Ntawv Thov suav nrog kev lag luam, kev tsim vaj tsev thiab kev lag luam siv. Plain Round Bar siv rau dab tsi? Cov kev siv feem ntau suav nrog footings, kab teeb, phab ntsa, muab faib vaj huam sib luag, khi thiab nqa, slabs, kab, khoom precast thiab pob zeb piers.

Q: Dab tsi yog qhov txawv ntawm ib puag ncig pas nrig thiab ib puag ncig bar?

A: Ib qho bar yog cov khoom siv uas muaj qhov sib txuas ntawm qhov chaw uas muaj qhov tsis sib xws los yog kev sib koom ua ke rau cov pob zeb. Ib tug pas nrig yog cov khoom uas yog txawm nto ncig hla ntu.

Q: Qhov txawv ntawm ib puag ncig bar thiab lub deformed bar yog dab tsi?

A: Round-shaped rebars yog kev lag luam ntau dua li deformed rebars, txawm li cas los xij, raws li lawv qhov chaw yog du hauv kev ntxhib los mos lawv tsis tiv taus slippage uas ua rau nws nyuaj rau cov pob zeb kom tau txais kev tuav zoo ntawm cov tuav. Qhov zoo dua yog tias lawv tuaj yeem txiav tau yooj yim thiab zoo li qhov xav tau, yog li lawv muaj ntau yam.

Q: Qhov loj npaum li cas yog round bar?

A: Me me steel round bar yog ntsuas los ntawm nws txoj kab uas hla. Nws tuaj yeem yuav qhov ntau thiab tsawg li 1/4 "inch thiab loj li 12" txoj kab uas hla.

Q: Puas yog rebar muaj zog dua round bar?

A: Thawj qhov sib txawv tseem ceeb yuav tsum nco ntsoov yog nyob rau hauv lub zog ntawm ob lub tuav. Lub rebar muaj ntau dua tensile thiab siab tshaj plaws dabtsi yog khoov zog. Cov khoom zoo li no ua rau nws cov khoom zoo tshaj plaws rau fortifying pob zeb.

Q: Qhov twg yog qhov muaj zog square bar lossis round bar?

A: Txawm hais tias steel tuav tuaj nyob rau hauv ntau yam duab, geometry ntawm square steel tuav ua rau lawv muaj zog, raws li lawv tuav lub siab zoo dua puag ncig tuav. Stainless hlau square tuav kuj tiv thaiv corrosion thiab hnav zoo heev, thaum sib txawv tiav ua rau lawv siv tau rau ntau yam kev siv.

Q: Dab tsi yog qhov txawv ntawm trunnion bar thiab round bar?

A: Qhov sib txawv loj tshaj plaws ntawm puag ncig thiab trunnion tuav yog txoj kev uas lawv txuas rau lub pob mount. Trunnion style tuav yog feem ntau yooj yim rau kev sib txuas txij li thaum lawv xaub mus rau hauv lub taub hau ntawm hitch los ntawm sab lossis nraub qaum. Qhov no tseem tso cai rau kev tshem tawm hauv av ntau dua li cov kab tuav ib txwm muaj.

Q: Dab tsi yog stainless hlau round bars siv rau?

A: Stainless hlau round tuav yog siv nyob rau hauv ntau yam machinery, mechanisms, li qub, fittings, nkoj, flanges, threading tuav, subways, tshuaj thiab roj tankers, signboards, escalators, elevators, nqa, thiab petrochemicals.

Q: Qhov twg yog qhov zoo dua deformed bar lossis reinforced bar?

A: Deformed bar yog siv qhov twg yuav tsum tau ntxiv dag zog rau cov ntaub ntawv los yog trench mesh. Los ntawm kev siv lub zog txhawb nqa hauv kev tsim kho, Nws tsim ib qho, monolithic pob zeb ua qauv nrog kev ua haujlwm siab, kev ntseeg siab thiab kev ncaj ncees. Nyob rau hauv tas li ntawd, cov cuab yeej txhawb zog nce stability thiab tsis kam mus rau mechanical stress.

Q: Vim li cas koj thiaj li siv ribbed tuav es tsis yog cov kab puag ncig tiaj tus li kev txhawb nqa?

A: Cov yam ntxwv ntawm cov xov hlau ribbed yog txhim kho ntau dua li cov kab ncaj nraim. Koj tuaj yeem siv ribbed xov hlau rau txhua hom tseem ceeb ntawm cov pob zeb muaj zog. Cov xov hlau no yog xeb-pov thawj thiab hloov tau yooj yim heev. Kev tuav thiab kho kuj yooj yim heev.

Q: Vim li cas deformed tuav feem ntau siv?

A: Deformed rebar muaj zog dua li lwm hom kev txhawb nqa tuav raws li nws tau tsim los txhawb nqa ntau dua li cov khoom siv dag zog. Nws tuaj yeem tiv taus 500MPa, piv rau 250MPa ntawm cov khoom siv khov kho du. Ntxiv rau, ntxiv rau qhov ua tau zoo dua, deformed reinforcing tuav kuj tau txais txiaj ntsig zoo dua.

Q: Dab tsi loj yog deformed puag ncig tuav?

A: Cov qib no muaj nyob rau hauv cov qauv loj xws li 10mm, 12mm, 16mm, 20mm, 25mm, 28mm, 32mm thiab 36mm. Qhov ntev ntawm qhov deformed bar yog 6m, 7.5m, 9m, 10.5m thiab 12m.

Q: Qhov txawv ntawm round bar thiab steel bar yog dab tsi?

A: Round bars feem ntau yog ua los ntawm cov hlau kub dov, thaum cov pas nrig feem ntau yog los ntawm cov hlau txias. Round bars muaj cov ntsiab lus carbon ntau dua li cov pas nrig, uas ua rau lawv zoo dua lub zog thiab hardness zog. Qws muaj cov ntsiab lus ntawm manganese ntau dua li cov kab puag ncig, uas ua rau lawv zoo dua hnav tsis kam.

Q: Puas yog cov raj hollow muaj zog dua li cov kav dej khov?

A: Lub zog rau qhov hnyav piv yog qhov zoo dua rau cov yeeb nkab hollow dua li cov pas nrig. Qhov no txhais tau hais tias lub tog raj kheej hollow muaj zog dua tus pas nrig ntawm qhov sib npaug thiab cov khoom siv tib yam. Ib lub tog raj kheej hollow nrog lub loj hauv txoj kab uas hla yog zoo dua.

Q: Dab tsi yog forged round bar?

A: Cov txheej txheem tsim khoom suav nrog kev txiav ingot nias ntawm ob lub ntsej muag tiaj tus tuag. Peb nias cov khoom kom txog thaum nws ua tiav nws txoj kab uas hla sab nraud thiab qhov ntev. Qhov tshwm sim yog forged bar engineered rau tawv thiab xav tau daim ntawv thov.

Q: Koj puas tuaj yeem khoov stainless hlau puag ncig bar?

A: Lub pas nrig stainless hlau tuaj yeem khoov tau ob txoj hauv kev, ib qho siv zog thiab ib qho siv cua sov. Los ntawm mechanically dabtsi yog khoov stainless hlau rods nrog ib tug nias nres, koj tsim muaj tseeb vojvoog khoov. Koj tuaj yeem siv lub teeb oxy-acetylene los ua kom sov tus pas nrig thiab khoov qhov chaw sov ntawm tus pas nrig yog tias koj tsis tuaj yeem nkag mus rau lub xovxwm nres.

Q: Dab tsi yog qhov muaj zog rebar lossis steel?

A: Reinforced steel los yog steel rebar yog zoo dua li hlau nyob rau hauv ntau txoj kev. Muab cov ntsiab lus ntxiv hauv nws, muaj ntau yam uas nws tuaj yeem ua tau thiab tiv taus, uas zoo dua piv rau cov hlau. Piv txwv li, nws yog non-corrosive. Hlau rebar, tsis zoo li hlau, tuaj yeem kav ntev txog ib puas xyoo yam tsis tau poob nws cov molecular kev ncaj ncees.

Q: Puas yog rebar kub lossis txias dov?

A: Kub
Feem ntau hom rebar yog carbon steel, feem ntau muaj cov kub dov puag ncig tuav nrog deformation qauv embossed rau hauv nws nto.

Q: Dab tsi yog qhov muaj zog square tubing lossis round tubing?

A: Round Tube Lub zog
Nrog rau cov duab cylindrical, tag nrho cov siab yog faib sib npaug los ntawm puag ncig aluminium tubing. Qhov no ua rau nws muaj zog heev thiab ruaj khov - ntau dua li square tubing thaum sib piv tib qhov hnyav, tshwj xeeb tshaj yog txij li cov tubing puag ncig yog kwv yees li 20% sib dua thaum sib piv qhov ntev sib npaug.

Q: Koj tuaj yeem qhia tau li cas yog tias steel forged?

A: Forgings. Qhib tuag forgings, yog tias tsis siv, feem ntau yuav pom cov cuab yeej cim ntawm sab nrauv qhov chaw uas lub cuab yeej forging tau nias tawm tsam cov khoom ua haujlwm kom zoo. Feem ntau, cov no yog ntau qhov "pav" cov cim uas lub workpiece tau hammered los yog nias ntau zaus thaum lub sij hawm forging txheej txheem.
Raws li ib qho ntawm cov khoom lag luam thiab cov muag khoom nyob rau hauv Suav teb, peb sov siab txais tos koj los yuav cov khoom lag luam zoo ntawm no los ntawm peb lub hoobkas. Tag nrho peb cov khoom yog nrog cov khoom zoo thiab cov nqi sib tw.

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