单项选择题
A.100-150mm B.80-150mm C.120-150mm D.150-200mm
A.l/2 B.1/3 C.1/4 D.1/5
A.30kg B.lOkg C.20kg D.25kg
A.10-20N.m B.30-40N.m C.40-50N.m D.40-65N.m
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