单项选择题
Fuel injection valves should be taken out, cleaned, and lifting checked every （）.
A.two to four months
B.four to six months
C.six to eight months
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相关考题
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Fuel injection uses the jet pump system and a Woodward type hydraulic （） is used to control engine speed.
A.controller
B.governor
C.instrument
D.apparatus -
单项选择题
Fuel injected into a diesel engines cylinder is ignited by （）.
A.the heat compressed fuel/air mixture in the cylinder
B.the fuel igniter
C.the fuel injector
D.the fuel pump -
单项选择题
Fuel has been injected but ignition fails The possible cause may be （）.
A.leaky exhaust valve
B.increased scavenging air temperature
C.engine cylinders not scavenged sufficiently
D.water in the fuel oil
