Doors are generally formed in the （） of the both in-line a

【名词&注释】

热处理(heat treatment)、测量法(measurement)、喷油泵(fuel injection pump)、轮机员(engineer)、生产厂家(manufacturer)、不完善(imperfect)、不一定(not always)、光学仪器法

[单选题]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.

A. bedplates
B. columns
C. cylinder blocks
D. safety ca

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[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^(imperfect)；Ⅴ.材质不佳。

A. A．Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ
B. B．Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ
C. C．Ⅰ＋Ⅳ＋Ⅴ
D. D．Ⅰ＋Ⅲ＋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。

A. 齿条和齿套
B. 柱塞和套筒
C. 齿条与泵体
D. 齿条与套筒

[单选题]舵系运动件的同轴度检验采用（）。

A. 平台测量法
B. 拉线法
C. 光学仪器法
D. 不一定^{(not always)}

[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 （）.

A. loss of suction in the circulating pump
B. leak in the primary cooling system
C. broken raw water pump shaft
D. burned or cracked piston in one cylinder

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

A. two crankshaft revolutions in a two-stroke/cycle engine
B. two power strokes in a two-stroke/cycle engine
C. one power stroke in a two-stroke/cycle engine
D. two piston strokes in a two-stroke/cycle engine

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