单项选择题
In a single acting, four-stroke/cycle diesel 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 stroke
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Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.
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单项选择题
Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.
A.water in the fuel oil supply
B.excessive fuel nozzle holder cooling
C.a distorted fuel spray pattern
D.leakage past the plunger into the oil drain
