正确答案: D

an injection system

题目：Fuel is delivered into the combustion space by （）.

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学习资料的答案和解析：

[单选题]吊缸发现燃烧室零件表面有水锈时，表明（）产生穿透性裂纹。

气缸或活塞

[单选题]排气阀阀杆磨损超过标准要求时，可采用（）工艺修复阀杆。也可以采用喷涂或喷焊工艺修复。

镀铬或镀铁

[单选题]增压器发生故障后锁住转子的措施简便，起到了缓解故障和防止故障扩大的作用，但缺点是（）。

长时间锁住转子将引起变形

[单选题]测量螺旋桨螺距时采用的量具是（）。

螺距规

[单选题]To avoid scavenge fires （） the engine timing and equipment maintenance should be correctly carried out.

occurring

[单选题]A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （）(1) MEP is lower and the scavenging air is cooling the exhaust gases(2) valve overlap in a four-stroke

(1) only is correct