单选题The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.AsuctionBcompressionCexpansionDexhaust
单选题
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
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