正确答案: C

Ⅲ＋Ⅳ＋Ⅴ

题目：艉轴裂纹主要发生在（）等处。Ⅰ.法兰根部；Ⅱ.工作轴颈；Ⅲ.铜套接缝处轴颈；Ⅳ.键槽根部；Ⅴ.锥部大端截面变化。

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学习资料的答案和解析：

[单选题]汽轮机动力装置与燃气动力装置相比，其主要缺点是（）。

效率低

[单选题]废气锅炉的排气流动阻力不能过大，因为二冲程低速柴油机增压器后的排气背压规定一般不宜超过（）。

A，B，C均可

[单选题]Fuels of high quality with their earlier ignitions will cause higher （）pressure in cylinders of a diesel engine.

maximum

[单选题]In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.

detergency

[单选题]On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）

cooling jacket

[单选题]The fuel injection system is very important, so any trouble of it will （） the operation of the main engine.

affect