单选题Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）Aentirely constant pressureBentirely constant temperatureCa combination of constant volume and constant pressureDa combination of constant temperature and constant pressure
单选题
Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）
A
entirely constant pressure
B
entirely constant temperature
C
a combination of constant volume and constant pressure
D
a combination of constant temperature and constant pressure
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