Pistons may be made in _____ in order to keep the weight down for balancing purposes at hi

职业资格 已帮助 人

Pistons may be made in _____ in order to keep the weight down for balancing purposes at high speed.

A.cast iron

B.forged steel

C.stainless steel

D.aluminum alloy

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。