單項選擇題

The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.

A.assist in a quick cutoff of fuel injection
B.allow oil backflow from the injector to the helix
C.reduce fuel oil pressure between injection strokes
D.meter the quantity of fuel delivered

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單項選擇題

Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of （）.

A.10
B.7
C.4
D.1

單項選擇題

If over a period of weeks the air-box pressure of a turbo-charged, diesel engine, operating at full load, appears to be dropping off, the cause can be （）.

A.open air-box drains
B.loss of cooling water to the diffuser
C.gradual fouling of the air filters
D.improperly timed exhaust valves

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The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.

你可能感興趣的試題

Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of （）.

If over a period of weeks the air-box pressure of a turbo-charged, diesel engine, operating at full load, appears to be dropping off, the cause can be （）.

99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精