单项选择题
(A)20N.m (B)25N.m (C)44N.m (D)59N.m
(A)0.5m (B)1.Om (C)1.5m (D)2.Om
(A)75mm (B)150mm (C)200mm (D)300mm
(A)3m (B)4m (C)5m (D)6m
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