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【单选题】
（） 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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举一反三
【单选题】What is the function of thermostatic expansion valve in a compression refrigeration system?
A.
nonexistent
B.
for controlling pressure
C.
for controlling superheat
D.
for controlling the solenoid valve
【单选题】Moisture is removed from a refrigeration system by
A.
bleeding refrigerant from the condenser
B.
opening a drain petcock on the oil separator
C.
condensing the water in the heat exchanger
D.
using a dehydrator cartridge
【简答题】为什么要清洗氟电极,使其响应电位值负于 320 mV ?
【单选题】Low compressor head pressure in a refrigeration system can be caused by（）.
A.
insufficient condenser cooling water
B.
excessive condenser cooling water
C.
air in the refrigeration system
D.
excessive refrigerant in the system
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