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问题

In diesel engines designed with a crosshead, the motion of the piston rod can be described as _____.


A.reciprocating at the piston pin, rotary at the crank pin

B.reciprocating at the crank pin, rotary at the piston pin

C.straight reciprocation

D.straight rotation

请帮忙给出正确答案和分析,谢谢!

参考答案
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