单项选择题
A.1/2圈B.1/3圈C.1/4圈D.1圈
A.250N·mB.500N·mC.750N·mD.1000N·m
A.300—400N·mB.400—500N·mC.500—600N·mD.600—700N·m
A.130mmB.260mmC.460mmD.920mm
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