单项选择题
A.8 B.10 C.15 D.20
A.0.35N·m±0.02N·m B.0.40N·m±0.02N·m C.0.45N·m±0.02N·m D.0.50N·m±0.02N·m
A.60N±2N B.70N±2N C.80N±2N D.90N±2N
A.25kg±0.3kg B.30kg±0.3kg C.35kg±0.3kg D.40kg±0.3kg
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