已知F=5t,L=400mm 拧紧力矩Ms=FL=5310339.8130.4=19.62(kN2m)
A.5 B.7 C.10 D.12
A.红 B.绿 C.蓝 D.白
A.0~2 B.0~3 C.0~4 D.±2