单项选择题
A.3.25mm B.4.75mm C.5.45mm D.7.25mm
A.3 B.6 C.9 D.12
A.M20；M25；M30；M35 B.M20；M15；M10；M5.0 C.M15；M10；M7.5；M5.0 D.M15；M10；M5.0；M2.5
A.70mm~90mm B.60mm~80mm C.50mm~70mm D.30mm~50mm
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