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问答题
如何检查及判断制冷装置中冷剂不足？
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单选题The crankshaft is of the semi built type, with the journal （） the forged or cast steel crank throws.A
shrunk intoB
expanded intoC
extended intoD
designated into
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单选题A sudden power loss from a turbocharged and after-cooled diesel engine is an indication of a/an（）A
turbocharger malfunction or failureB
crankcase exhauster overloadC
overload on the intercoolerD
obstruction in the engine cylinders
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单选题为了消除电离层折射误差，GPS卫星导航仪（）。A
只接收5°～85°的GPS卫星信号B
HDOP由操作者置于10C
接收1575.42MHz和1227.60MHz两种频率的GPS信号D
不在日出、没前后1小时内使用
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单选题Which of the listed statements is correct concerning refrigeration systems?（）A
Dehydrators must be used continuously in a refrigeration systemB
A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hoursC
A thermostatic expansion valve is used to control refrigerated space temperatureD
The liquid receiver functions to collect and remove non- condensable gases
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单选题单锚泊船在大风中发生偏荡运动，当偏荡到何处时，船的惯性力最小？（）A
向左（右）偏荡到最大端（回折处）B
从平衡位置向左（右）偏荡到最大端的1／2距离处C
从平衡位置向左（右）偏荡到最大端的1／3距离处D
平衡位置处
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单选题In order to improve the efficiency of the communication with shore personnel, you should（）A
inform the chief engineer whenever there are problemsB
reduce the time wasted on checking itemsC
know who is responsible for the domestic cleaning equipmentD
know the chain of authority on the ship
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单选题There is not（）depth of water around the area centered at the lighthouse.A
ampleB
sufficientC
enormousD
incredible
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单选题Such remarks as WITHOUT RESPONSIBILITY FOR DAMAGE OR SHORTAGE will be considered（）by a court.A
valuableB
invaluableC
valuelessD
priceless
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单选题A twin screw craft being used to pick up a person who has fallen overboard from a vessel should approach if you（）.A
reverse port engine, apply right rudderB
reverse port engine,rudder amidshipsC
reverse starboard engine, apply right rudderD
revers starboard engine, rudder amidships
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单选题The implied condition(s) with respect to the doctrine of deviation in a marine insurance policy is(are)（）.A
that the cargo be discharged from the vessel with customary dispatchB
that the voyage be commenced in a reasonable timeC
that the voyage be pursued over the usual and direct routeD
All of the above
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单选题关于日光灯及照明线路的下列叙述，错误的是（）。A
采用电子镇流器后，不需要启动器辅助点燃B
频繁点燃，会使阴极物质消耗快，减低其寿命C
日光灯机理属于热辐射光源D
点燃后日光灯的镇流器起到降压限流作用
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单选题轮机长在填写轮机部航次报告时，（）应以甲板部航次报告为准。A
平均理论航速B
航行里程C
主机快车实际转数D
主机运行时间
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