单项选择题
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
单项选择题 In a single acting, two-stroke/cycle, diesel generator engine, the power impulse in an individual cylinder occurs （）
单项选择题 Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）
单项选择题 The over-speed trip device installed in some diesel engines is automatically actuated by（）