单项选择题
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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相关考题
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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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A.controller
B.governor
C.instrument
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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
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