【名词&注释】
水位计(water level gauge)、超负荷(overload)、冷却水腔(cooling water-jacket)、机动船(motor vessel)、水连通管
[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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举一反三：
[单选题]下列哪些船舶应保持正规瞭望？________。
A. 独木船
B. 锚泊中的从事非拖网作业的非机动船
C. 失控船
D. 以上均应保持正规瞭望
[单选题]Which channel is designated for VHF Digital Selective Calling?
A. Channel 70
B. Channel 06
C. Channel 13
D. Channel 16
[单选题]属开放性骨折的是()
A. 骨折处与外界相通
B. 骨折处皮肤破损
C. 骨折处于外界不相通
D. 股多段折不与外界相通
[单选题]由于( )等维护保养不良，将引起气缸盖产生疲劳裂纹。
A. 超负荷
B. 冷却水腔积垢过多
C. 润滑不良
D. 启动、停车频繁
[单选题]To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the_______ .
A. suction service valve as a vapor
B. suction service valve as a liquid
C. discharge service valve as a vapor
D. charging valve as a liquid
[单选题]叫水操作时，若慢慢开启通水阀，发现水位一直升到水位计顶部则表明()。
A. 水位位于最高工作水位
B. 水位位于最低工作水位
C. 水位高于水连通管
D. 水位低于水连通管
[单选题]The chief foreman asked the stevedores not to forget to use separation nets to avoid________ different lots of cargo
A. mix in
B. mix with
C. mixing up
D. mixing into
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