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28. 下述哪一项改进不能节约材料

A、搅拌浆实心轴变为空心轴

B、矩形梁变为工字钢梁

C、圆形梁变为槽钢梁

D、槽钢梁变为工字钢梁

时间：2021-09-01 16:44 关键词：青书学堂平顶山学院机械电子工程机械制造装备设计

答案解析

C

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