单选题An indicator card or pressure-volume diagram, shows graphically the （）Acompression ratio of the engineBvolume of the engineCrelationships between pressure and volume during one stroke of the engineDrelationships between pressure and volume during one cycle of the engine
单选题
An indicator card or pressure-volume diagram, shows graphically the （）
A
compression ratio of the engine
B
volume of the engine
C
relationships between pressure and volume during one stroke of the engine
D
relationships between pressure and volume during one cycle of the engine
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