Txoj moo
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2 feeb kom nkag siab txog cov txheej txheem ntau lawm ntawm kub dov seamless steel yeeb!
Kev txhim kho keeb kwm ntawm seamless steel yeeb nkab yeeb nkab muaj keeb kwm ntawm ze li 100 xyoo. Tus neeg German Manesmann cov kwv tij ua ntej tsim ob yob hla dov piercer hauv 1885, thiab cov pa yeeb nkig nplej rau hauv xyoo 1803, ...Nyeem ntxiv -
Boiler Steel Kav: Kev siv hluav taws xob ua haujlwm thiab kev nyab xeeb hauv cov tshuab thermal
Cov Khoom Piav Qhia Boiler Steel Kav yog ib qho tseem ceeb hauv kev lag luam hauv kev lag luam niaj hnub, los ntawm cov kev siv hauv ntau lub zog rau cov txheej txheem. Cov kav dej no yog tsim los rau hauv ...Nyeem ntxiv
Xaiv cov pab pawg hlau ua haujlwm?
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