正确答案: A

the crankcase explosion

题目：If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in （）.

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学习资料的答案和解析：

[单选题]船轴表面裂纹可采用（）进行无损检测。Ⅰ.着色探伤；Ⅱ.煤油-白粉；Ⅲ.磁粉探伤；Ⅳ.超声波探伤；Ⅴ.X射线探伤。

Ⅰ＋Ⅲ

[单选题]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。

Ⅲ＋Ⅳ＋Ⅴ

[单选题]消除螺旋桨鸣音的办法是将随边0.4R～0.8R部分（），从而改变涡流引起的振动频率。

形状改变

[单选题]Bridge gauge can be used to measure （） of a diesel engine.

diameters of journals

[单选题]Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the （）.

compression stroke

[单选题]The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）

the operation of the thermostatic valve

[单选题]Waterside scale in a fire-tube boiler may cause （）.

overheated tube