题目内容

Cooling of engines is achieved by circulating a cooling liquid around internal ______within the engine.

A. air
B. passages
C. pipes
D. means

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In a diesel engine, when refitting piston rings you should______. I. check the ring gap at

A. I only
B. II only
C. both I and II
D. neither I nor II

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Fuel has been injected but ignition fails. The possible cause may be ______.

A. slightly leaky exhaust valve
B. increased scavenging air temperature
C. engine cylinders not scavenged sufficiently
D. too much water in the fuel oil

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During the valve overlap period, the exhaust pressure of a turbocharged four-stroke/cycle

A. effective cylinder scavenging and cooling
B. constant pressure from the turbochargers
C. cooler operation of the exhaust system
D. effective constant pressure for turbocharger operation

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The meat box temperature control circuit, as used in the ship service refrigeration system, is an example of ______.

A. two position control
B. single speed floating control
C. proportional(比例) control
D. reset control

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Cooling of engines is achieved by circulating a cooling liquid around internal ______within the engine.

A. air B. passages C. pipes D. means

In a diesel engine, when refitting piston rings you should______. I. check the ring gap at

Fuel has been injected but ignition fails. The possible cause may be ______.

During the valve overlap period, the exhaust pressure of a turbocharged four-stroke/cycle

The meat box temperature control circuit, as used in the ship service refrigeration system, is an example of ______.

A. air
B. passages
C. pipes
D. means