单项选择题
（） shall be continuously powered and shall have an automatic changeover to a stand by power supply in case of loss of normal power supply.
A.Cooling system
B.Alarm system
C.The air conditioning installation
D.The mooring equipment
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The liquid flowing in the capillary is such that the difference in （） readings taken before the capillary and after it is related to the oil viscosity.
A.pressure
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C.flow rate
D.temperature -
单项选择题
The switchboards for a-csystems differ from the d-cswitch gear in that the open type panels are generally（） and the dead-front switch gear is the common rule.
A.permissibly
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C.no permissible
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Electrical supply is always needed even if only for lighting so after a ship goes into service it is extremely rare for the main bus-bars to be dead, it therefore follows that the bus-bars are continuously alive（） the life of the ship.
A.along
B.will
C.throughout
D.for
