由于废气涡轮增压器（），所以它属于精密机械。

【名词&注释】

废气涡轮增压器(exhaust driven supercharger)、中国船级社(china classification society)、精密机械(precision machine)

[单选题]由于废气涡轮增压器（），所以它属于精密机械。

A. 结构复杂
B. 高速运转
C. 温度高
D. 配合间隙小

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学习资料：

[单选题]中国船级社要求营运船舶的曲轴臂距差为（）时，应限期修理。

A. ＜0.125S
B. （0.125～0.25）S
C. ＞0.25S
D. ＞0.30S

[单选题]主机底脚螺栓松动则可能导致（）。Ⅰ.垫块磨损；Ⅱ.机座局部下沉；Ⅲ.曲轴变形；Ⅳ.主机振动。

A. Ⅱ＋Ⅳ
B. Ⅰ＋Ⅲ
C. Ⅱ＋Ⅲ＋Ⅳ
D. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ

[单选题]相邻轴同轴，其连接法兰处偏中值为（）。

A. A．δ＝0、φ＝0
B. B．δ≠0、φ≠0
C. C．δ＝0、φ≠0
D. D．δ≠0、φ＝0

[单选题]中间轴承的布置如果数量多、间距小（）。Ⅰ.则轴线变形的牵制作用增强；Ⅱ.会使轴承增加附加负荷

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅱ
D. Ⅰ或Ⅱ

[单选题]At the top of the A-frames there is a strong cast iron frame called （）.

A. cylinder liner
B. cylinder cover
C. the gear box
D. the scavenging box

[单选题]If diesel oil in this tank is used, the （） of the oil must not exceed 120 degree F.

A. viscosity
B. flash point
C. acid value
D. temperature

[单选题]Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to （）.

A. react with insufficient speed droop
B. fail to react to small speed changes
C. have excessive sensitivity to small speed changes
D. remain in the neutral positio

[单选题]The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）

A. the same, whether at sea, or during maneuvering
B. adjusted during each hour of operation while at constant RPM
C. higher at sea than while maneuvering
D. lower at sea than while maneuvering

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