正确答案: B

columns

题目：Doors are generally formed in the （） of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.

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学习资料的答案和解析：

[单选题]柱塞-套筒偶件卡紧或咬死是由于（）原因所致。Ⅰ.机械杂质；Ⅱ.油压过高；Ⅲ.配合间隙太小；Ⅳ.零件材料热处理不完善；Ⅴ.材质不佳。

B．Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ

[单选题]在重新组装回油孔调节式喷油泵时，为了保证齿条刻度指示的零位与柱塞套筒的实际零位（油泵柱塞直槽对准套筒上的回油孔）一致，生产厂家在（）之间做了对中记号，轮机员必须将两者对齐。

齿条和齿套

[单选题]舵系运动件的同轴度检验采用（）。

拉线法

[单选题]If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.

leak in the primary cooling system

[单选题]In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.

two piston strokes in a two-stroke/cycle engine