【名词&注释】
经济性(economy)、动力装置(power plant)、机动性(mobility)、基本要求(basic requirements)、续航力(endurance)
[单选题]油润滑艉轴承的长度应不小于()倍的艉轴直径。
A. 2
B. 3
C. 4
D. 5
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学习资料:
[单选题]对商船动力装置的基本要求是()。
A. 经济性、可靠性
B. 机动性、续航力(endurance)
C. 尺寸与重量
D. A+B+C
[单选题]If the engine does start on air, but combustion does not immediately begin, the cause may not be ().
A. low compression
B. failure of the fuel pump to discharge fuel
C. incorrect timing of fuel pump
D. turning gear being still o
[单选题]In the four-stroke engine, it takes () to make one power stroke.
A. one propulsion
B. two propulsions
C. two revolutions
D. one revolutio
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