It is during （） that work energy is being put into the engine; during the other 3 strokes of the piston, the engine is having to do the work.<br>A:the suction stroke<br>B:the compression stroke<br>C:the expansion stroke<br>D:the exhaust stroke

It is during （） that work energy is being put into the engine; during the other 3 strokes of the piston, the engine is having to do the work.
A:the suction stroke
B:the compression stroke
C:the expansion stroke
D:the exhaust stroke

出自：海船船员证

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