A.8 B.10 C.15
A.上屈服點(diǎn)或下屈服點(diǎn) B.屈服點(diǎn)或上屈服點(diǎn) C.屈服點(diǎn)或下屈服點(diǎn)
A.64HR B.640HV30/20 C.500HBW750/5