单项选择题
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
A.hydraulic
B.electric
C.steam
D.diesel
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单项选择题
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
A.increase the amount of cooling water to the condenser
B.decrease the amount of cooling water to the condenser
C.add more refrigerant to the system
D.remove some refrigerant from the system -
单项选择题
Which of the following statements is correct concerning heat transfer?（）
A.Heat is given off from a high temperature region known as a heat sink
B.Heat transfer rate is affected most by the size of the heat sink involved
C.Heat transfer rate is affected most by the temperature difference between the heat source and the heat sink
D.Heat transfer by radiation will occur only by mass motion of a fluid substance -
单项选择题
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
A.Maritime Safety Administration
B.Master of the vessel
C.Chief Engineer
D.Chief Mate
