單項(xiàng)選擇題Fuel is delivered into the combustion space by （）.
A.a cooling system
B.a lubricating system
C.an electric system
D.an injection system
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1.單項(xiàng)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
2.單項(xiàng)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
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