In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.

[单选题]Marine four-stroke diesel engines are mainly （）.A . of crosshead typeB . of trunk piston typeC . of low speed typeD . all the above

[单选题]_____ the engines, the diesel engine is ____ used engine on boardA．Between / more commonlyB．Among / the most commonlyC．Between / not more commonlyD．Among / not the most commonly

[单选题]With four-stroke engines, it takes four revolutions of the crank shaft to make （） power stroke(s).A . 1B . 2C . 4D . 8

[单选题]D．iesel engines are started by supplying into the cylinders in the appropriate sequence for the required direction.A．cooling waterB．compressing airC．compressed airD．cylinder oil

[单选题]（） the engines, the diesel engine is（） used engine on board.A . Between；more commonlyB . Among；the most commonlyC . Between；not more commonlyD . Among；not the most commonly

[单选题]Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.A . cooling waterB . compressing airC . compressed airD . cylinder oil

[单选题]Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）A . camshaft beatingsB . main bearingsC . piston crownsD . cylinder wall

[单选题]In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.A . reciprocating at the piston pin, rotary at the crank pinB . reciprocating at the crank pin, rotary at the piston pinC . straight reciprocationD . str

[单选题]All diesel engines are classified as（）.A . four cycleB . compression ignitionC . vacuum ignitionD . external combustio

[单选题]The crankcase of many diesel engines are kept under a slight vacuum by the （）.A . scavenging action of the pistonB . piston type vacuum pump taking suction off a differential manometerC . gland exhausting manometerD . crankcase exhaust fa