Peb tsim txhua yam khoom raws li nws tus qauv. Tam sim no peb muaj cov pwm tsis tsuas yog rau European lub teb chaws tus qauv tab sis kuj American tus qauv xws li DIN8077/8078, DIN8062, ISO4422, ASTM D2466, ASTM D2467, ASTM F439, ASTM F441, ASTM D2846, ASNZ2053, A250, ISO, ASNZ2053, A250, ISO1000 BS 4346, BS 5255, BS 4514.
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