单项选择题
A.1/4转和1/2转 B.1/4转和1/3转 C.1/3转和1/2转
A.6等或3级 B.6等或4级 C.5等或4级
A.0.010mm B.松开为0.006,紧固为0.010mm C.0.006mm
A.0.006mm B.0.01mm C.0.015mm
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