be clear
be blue
be light green
show bubbles
第1题：
insufficient condenser cooling water
excessive condenser cooling water
air in the refrigeration system
excessive refrigerant in the system
第2题：
a shortage of refrigerant in the system
air in the system
an accumulation of liquid refrigerant in the crankcase
a shortage of oil in the crankcase
第3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
第4题：
compressor
condenser
receiver
evaporator
第5题：
compressor；condenser
condenser；evaporator
throttle valve；evaporator
evaporator；condenser
第6题：
liquid receiver
compressor
condenser
cooling coil
第7题：
be clear
be blue
be light green
show bubbles
第8题：
Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.
A.carbon deposits on the compressor suction valves
B.the evaporator temperature to increase
C.rapid corrosion of the thermal expansion valve
D.no operating problems
第9题：
restriction in refrigerant piping
air and non-condensable gases in the condenser
water in the refrigerant
flooding back of liquid refrigerant from the evaporator
第10题：
continuous running of the compressor
high suction pressure
high discharge pressure
short cycling of the compressor on the water failure switch