單項選擇題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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1.單項選擇題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
2.單項選擇題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
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