In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.<br>A:reciprocating at the piston pin, rotary at the crank pin<br>B:reciprocating at the crank pin, rotary at the piston pin<br>C:straight reciprocation<br>D:straight rotation

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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