（） device is provided to prevent starting air from being a

【名词&注释】

动力装置(power plant)、有效热效率(effective thermal efficiency)、螺旋桨推力(propeller thrust)

[单选题]（） device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed.

A. An automatic
B. A transmission
C. A self-regulating
D. An interlocking

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学习资料：

[单选题]低速柴油机的最低稳定转速不高于标定转速的（）%。

A. 15
B. 30
C. 40
D. 45

[单选题]动力装置有效热效率是指（）。Ⅰ.每小时螺旋桨推力功的相当热量与同一时间内动力装置消耗的燃油完全燃烧所发出的总热量之比Ⅱ.3600kJ与动力装置每千瓦小时所消耗燃油（燃油消耗率的燃油）的热量之比

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ，Ⅱ都对
D. Ⅰ，Ⅱ都不对

[单选题]对使用液压撑杆螺栓的正置式主轴承，因其一端顶在轴承盖上，另一端顶在机架上，所以在上紧贯穿螺栓之前，必须先（）的撑杆螺栓。

A. 上紧全部
B. 上紧相应
C. 松开全部
D. 松开相应

[单选题]As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.

A. being compressed
B. to be pumped up
C. is pressurized
D. are built u

[单选题]In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.

A. crosshead
B. crankpin
C. crank journal
D. gudgeon pi

[单选题]The fuel oil system for a diesel engine can be considered in two parts--the fuel supply and the （） systems.

A. fuel treatment
B. fuel combustion
C. fuel injection
D. fuel separating

[单选题]In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.

A. jacket water outlet
B. cooling water pump outlet
C. heat exchanger outlet
D. expansion tank atmospheric vent

[单选题]What is the purpose of the intake/exhaust valves in a diesel engine? （）

A. They regulate the combustion cycle
B. They supply cooling water
C. They synchronize the ignition spark
D. They supply and regulate the lubricant flow

[单选题]如果细胞甲比细胞乙的RNA含量多，可能的结果是（）

A. 甲合成的蛋白质比乙多
B. 甲含的染色体比乙多
C. 乙合成的蛋白质比甲多
D. 甲含的DNA比乙

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