单选题Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）Aa combination of constant volume and constant pressureBa combination of constant temperature and constant pressureCentirely constant pressureDentirely constant volume
单选题
Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）
A
a combination of constant volume and constant pressure
B
a combination of constant temperature and constant pressure
C
entirely constant pressure
D
entirely constant volume
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