单选题In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.Areciprocating at the piston pin, rotary at the crank pinBreciprocating at the crank pin, rotary at the piston pinCstraight reciprocationDstraight rotation
单选题
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
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