【名词&注释】
空压机(air compressor)、排气量(displacement)
[单选题]空压机后冷却良好不能使( )。
A. 进气瓶气体含液量减少
B. 排气量明显增加
C. 进气瓶空气比容减小
D. 进气瓶空气温度降低
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举一反三：
[单选题]保证船舶海上安全航行的首要做法是_________。
A. 保持正规瞭望
B. 使用安全航速
C. 判断碰撞危险
D. 采取避让行动
[单选题]Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.
A. The direction of pressure on the journal in four-stroke engine is continuously
B. positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
C. four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
D. Low-stroke engines usually consume less lube oil than four-stroke engines
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