正确答案: D

Ⅰ+Ⅱ+Ⅲ

题目：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.保证船舶动力装置及设备处于随时可启动和运行

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学习资料的答案和解析：

[单选题]双轴系具有高速、（）和（）的特点。

机动性好/生命力强

[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 （）.

compression 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.

timing

[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.

level

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

density

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

should be correctly carried out

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

clear