单项选择题
A.6 B.8 C.10 D.12
A.带槽螺母 B.圆螺母 C.六方螺母 D.双头螺栓
A.40mm B.6.5mm C.18mm D.10mm
A.6.5mm B.7.0mm C.7.5mm D.8.0mm
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