As the plunger moves upwards in the barrel, injection will commence once the plunger has （） the spill ports and the pressure builds up.

A、opened up

B、closed off

C、lined up

D、taken off

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更多“As the plunger moves upwards in the barrel, injection will commence once the plunger has （） the spill ports and the pressure builds up.”相关的问题

第1题

[单选题] As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.

A、being compressed B、to be pumped up C、is pressurized D、are built up

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第2题

[单选题] If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）

A、only the replacement of the entire pump would be acceptable B、the injection pump and injection nozzle must be replaced C、either the barrel or plunger must be replaced D、the barrel and plunger must be replaced as a unit

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第3题

[单选题] 不要随意地移动稳索。（）

A、Don’t shift the guy as you like. B、Don’t shift the stay as you like. C、Don’t move the derrick as you like. D、Don’t move the crane as you like.

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第4题

[单选题] Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）

A、grinding the spare plunger to the barrel B、replacing the plunger and the barrel C、highly polishing both the plunger and barrel D、replacing plunger only

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第5题

[单选题] When fighting a fire on a bulkhead using a portable carbon dioxide extinguisher，the stream should be directed at the（）.

A、base of the flames，moving the horn from side to side，following the flames upward as they diminish B、top of the flaming area，moving the horn from side to side，following the flames downward as they diminish C、center of the flaming area，moving the horn vertically from top to bottom D、bottom of the flaming area，moving the horn vertically to the top following the flames upward as they diminish