单项选择题
A.30kg B.lOkg C.20kg D.25kg
A.10-20N.m B.30-40N.m C.40-50N.m D.40-65N.m
A.30° B.40° C.45° D.50°
A.1% B.2% C.3% D.4%
微信扫一扫,加关注免费搜题