备车的正确理解是（）。Ⅰ.保证船舶开航；Ⅱ.保证船舶机动航行；Ⅲ.

【名词&注释】

机动性(mobility)、船舶动力装置(marine power plant)、生命力强、正确理解(correct understanding)

[单选题]备车的正确理解^{(correct understanding)}是（）。Ⅰ.保证船舶开航；Ⅱ.保证船舶机动航行；Ⅲ.保证船舶动力装置及设备处于随时可启动和运行

A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅳ
D. Ⅰ+Ⅱ+Ⅲ

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学习资料：

[单选题]双轴系具有高速、（）和（）的特点。

A. 便于操纵/工作可靠
B. 操纵灵活/生命力强
C. 机动性好/生命力强
D. 操纵灵活/工作可靠

[单选题]A distance piece, with ground faces, may be interposed between the rod and the bearing housing, its thickness being chosen to ensure the correct （）.

A. expansion ratio
B. pressure ratio
C. compression ratio
D. clearance ratio

[单选题]Engine （） refers to the relative time of position of crank, at which each operation during the cycle is commenced and is completed.

A. timing
B. power
C. firing order
D. dead center

[单选题]If the sump（）were to rise this would indicate water leakage into the oil an d an investigation into the cause must be made.

A. temperature
B. viscosity
C. lever
D. level

[单选题]The pressurized air is usually cooled to increase the charge air （）.

A. viscosity
B. density
C. velocity
D. electricity

[单选题]To avoid scavenge fires occurring the engine timing and equipment maintenance （）.

A. should be correctly carried out
B. should correctly be taken place
C. should carded with care
D. must to carry out with great care

[单选题]The color of the exhaust from a diesel engine should be （）

A. clear
B. hazy light brown
C. hazy light blue
D. hazy light grey

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