题目内容
要锻造直径为60mm,高为30mm的圆柱形毛坯,需截取直径为40mm的圆钢长
[ ]
A.67.5mm
B.45mm
C.135mm
D.90mm
B.45mm
C.135mm
D.90mm
A
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要锻造直径为60mm,高为30mm的圆柱形毛坯,需截取直径为40mm的圆钢长( )
A、67.5mm | B、45mm | C、135mm | D、90mm |