单项选择题
A.5mm B.12mm C.22mm D.10mm
A.蜗杆大于蜗轮 B.相等 C.蜗轮大于蜗杆 D.与蜗轮齿数有关
A.12mm B.10mm C.26mm D.2.6mm
A.m B.mZ C.1.2mZ D.1.2m
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