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【简答题】
“施工现场的检验员详细记录了每批水泥和钢筋的供货单位、规格型号、数量及使用单位等信息。”
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【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
【单选题】In the refrigeration system, the meat box temperature control circuit, as used in the ship service refrigeration system, is an example of _____.
A.
two position control
B.
single speed floating control
C.
proportional control
D.
reset control
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