The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.<br>A:suction<br>B:compression<br>C:expansion<br>D:exhaust

The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.
A:suction
B:compression
C:expansion
D:exhaust

出自：海船船员证

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