Each cylinder liner on the marine medium speed engines （）.

【名词&注释】

冷却系统(cooling system)、液压油(hydraulic oil)、活塞环(piston ring)、异常现象(abnormal phenomena)、超负荷(overload)、柴油机气缸套(engine cylinder liner)、二冲程柴油机(two-stroke diesel engine)、穿透性裂纹、冷却水温(cooling water temperature)、曲轴箱油(crankcase oil)

[单选题]Each cylinder liner on the marine medium speed engines （）.

A. is usually cooled by sea water
B. can be replaced when worn out
C. is in direct contact with the water in the bore of the cylinder
D. can t expand when heated

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学习资料：

[单选题]假设某一中央冷却系统中设有三台循环水泵，船舶航行在温带水域若只要两台水泵正常工作就能满足冷却需要，则三台水泵从可靠性角度看就成为（）。Ⅰ.并联系统；Ⅱ.串联系统；；Ⅲ.表决系统

A. 仅Ⅰ对
B. 仅Ⅱ对
C. 仅Ⅲ对
D. Ⅰ，Ⅱ都对

[单选题]二冲程柴油机^{(two-stroke diesel engine)}气缸套产生穿透性裂纹，柴油机运转时就会发现（）异常现象。

A. A．冷却水温^{(cooling water temperature)}度升高
B. B．膨胀水柜水位波动
C. C．滑油乳化变质
D. D．曲轴箱油^{(crankcase oil)}位升高

[单选题]气缸套内圆表面主要有（）等损坏形式。Ⅰ.磨损；Ⅱ.断裂；Ⅲ.腐蚀；Ⅳ.裂纹；Ⅴ.拉缸。

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

[单选题]除工艺原因外，柴油机气缸套与活塞环工作表面间油膜变薄或遭到破坏，是由于（）等因素造成。Ⅰ.润滑不良；Ⅱ.活塞运动装置对中不良；Ⅲ.冷却不良；Ⅳ.超负荷；Ⅴ.工作表面粗糙度低。

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

[单选题]液压拉伸器的液压系统中的液压油绝对不可使用（）。Ⅰ.液压油；Ⅱ.系统润滑油；Ⅲ.高级润滑油；Ⅳ.气缸油；Ⅴ.透平油。

A. Ⅳ＋Ⅴ
B. Ⅱ＋Ⅲ
C. Ⅱ＋Ⅳ
D. Ⅰ＋Ⅳ

[单选题]桨叶上各半径截面上的截面螺距的算术平均值称为（）螺距。

A. 桨叶
B. 桨叶总
C. 桨叶平均
D. 桨叶实测

[单选题]Cylinders of marine diesel engines are normally cooled by （）.

A. sea water
B. fine mineral oil
C. sanitary water
D. fresh water

[单选题]Increasing the load on an engine equipped with a constant speed mechanical governor, will cause the engine speed to initially （）.

A. increase
B. decrease
C. fluctuate
D. remain constant

[单选题]Lube oil cannot be efficiently filtered if its （）.

A. viscosity is too low
B. temperature is too low
C. pump discharge pressure is higher than the systems pressure
D. pump capacity is greater than the systems need

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