Tau txais kev hais nqe dawb 24 teev lossis nug txog cov ntsiab lus ntxiv ntawm cov khoom.
ASTM lub kaum sab xis, kuj hu ualub kaum sab xis hlau, yog ib qho ntawm cov khoom siv hlau nrov tshaj plaws hauv kev lag luam thoob ntiaj teb thiab kev lag luam hauv kev tsim kho vaj tse.Cov tuav kaum sab xisua raws li ASTM cov qauv muab lub zog zoo tshaj plaws, kev ruaj khov, thiab kev ywj pheej, uas ua rau lawv zoo tagnrho rau ntau qhov kev txhawb nqa thiab kev siv bearing.
Chaw Nyob
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Lub sijhawm tshaj tawm: Lub Ob Hlis-04-2026