A-A+
In diesel engines designed with a crosshead the motion of the piston rod can be described..
问题详情
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！
