A.613mm B.132mm C.320mm D.612mm
A.標(biāo)準(zhǔn)螺栓 B.非標(biāo)準(zhǔn)螺栓 C.英制螺栓 D.米制螺紋
A.漸發(fā)性故障 B.突發(fā)性故障 C.預(yù)測(cè)性故障