【单选题】What is the function of thermostatic expansion valve in a compression refrigeration system?
B.
for controlling pressure
C.
for controlling superheat
D.
for controlling the solenoid valve
【判断题】删除会计科目时,应先删除上一级科目 , 然后再删除本级科目。
【判断题】架构既可以展现花材的色彩美,也可以展现线条美。
【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