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【单项选择题】

The operation of which aids to navigation may be suspended during war or national emergency（）.

A、A.Navigational satellites

B、B.Loran

C、C.Omega

D、D.Any of the above

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更多“The operation of which aids to navigation may be suspended during war or national emergency（）.”相关的问题
第1题
[] Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?（）

A、A.The colder seawater passing through the condenser tube bundles of the various stages increases evaporator vacuum  B、B.The amount of heated feed water discharged from the feed water heater after cndenser is increased  C、C.Fewer non-condensable gases are created by the flow of colder seawater  D、D.More seawater is allowed to pass through the flint stage overflow weir  

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第2题
[单选题] The quality of the fuel oil and lube oil （）, Im afraid.

A、has much to do with the operation of the engine and its life  B、have much to do with the operation of the engine and its life  C、has much doing with the operation of the engine and its life  D、have much doing with the operation of the engine and its life  

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第3题
[单选题] One of the benefits of the new model is that it is easier（）than the old one.

A、operating  B、to be operated  C、to operate  D、operated  

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第4题
[单选题] How many operators are needed／required on board according to the provisions of the International Convention for the Safety of Life at Sea，1974?（）.

A、4 operators  B、3 operators  C、2 operators  D、1 operator  

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第5题
[单选题] All of the followings are the detainable deficiencies under the SOLAS Convention expert（）.

A、Failure of proper operation of propulsion and other essential machinery, as well as electrical installation  B、Failure of the proper operation of the main and auxiliary steering gear  C、Failure of engineering watch arrangements to confirm to the requirements specified for the ship by Administration  D、Failure of the proper operation of emergency generator, lighting, batteries and switches  

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第6题
[] A quite simple method of improving a berth’s capacity is（）.

A、A.to increase the arrival／start of operations interval  B、B.to increase the finishing of operations／leaving berth interval  C、C.to decrease both the arrival／start of operations interval and the finishing of operations／leaving berth interval  D、D.to decrease working shifts  

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第7题
[单选题] Before a Flashback Table operation, you execute the following command: ALTER TABLE employees ENABLE ROW MOVEMENT; Why would you need this to be executed?（）

A、Because row IDs may change during the flashback operation  B、Because the object number changes after the flashback operation  C、Because the rows are retrieved from the recycle bin during the flashback operation  D、Because the table is moved forward and back to a temporary during the flashback operation  

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第8题
[单选题] The SMS should provide for specific measures aimed at promoting the reliability of equipment or systems （） may result in hazardous situations.

A、which the sudden operational failure  B、that the sudden operational failure  C、the sudden operational failure  D、the sudden operational failure of which  

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第9题
[单选题] Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?（）

A、The density of the air entering the compressor  B、The temperature of the air entering the compressor  C、The designed rotating speed of the compressor  D、A leaking head gasket  

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第10题
[] Which of the following statements is TRUE regarding crane operations（）.

A、A.Radio communications allow the crane operator to disregard the use of hand signals  B、B.The crane operators and signalman must be familiar with the correct hand signals  C、C.The forward cranes can be operated from the bridge  D、D.The aft cranes can be operated from the aft steering station  

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