单项选择题
In a single acting, two-stroke/cycle, diesel generator engine, the power impulse in an individual cylinder occurs （）
A.once every crankshaft revolution B.once every two crankshaft revolutions C.once every piston stroke D.twice every piston stoke
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（）
单项选择题 The flywheel reduces speed fluctuations by （）
