gate valve
globe valve
check valve
plug cock
第1题：
Which of the problems listed could cause erosion of the expansion valve disks and seats?
A.Overcharging the system with refrigerant
B.Faulty compressor suction valve
C.Failure of the high pressure cutout
D.Flash gas formed in the liquid line
第2题：
A fire of escaping liquefied flammable gas is best extinguished by ______.
A.cooling the gas below the ignition point
B.cutting off the supply of oxygen
C.stopping the flow of gas
D.interrupting the chain reaction
第3题：
The______is used to measure the volume of a liquid or gas through a pipeline within any given period of time
A.flow-meter
B.viscometer
C.micrometer
D.feeler
第4题：
filled
evacuated
compressed
charged
第5题：
evaporation
frosting
condensing
compressing
第6题：
The flash point of a liquid refers to the temperature ______.
A.at which a liquid will give off inflammable（易燃的） vapors
B.at which a liquid will burn steadily
C.at which a liquid will explode
D.that a liquid must reach before it will flow readily
第7题：
cargo pump failure
blower failure
deck seal low water level
low inert gas temperature
第8题：
To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the_______ .
A.suction service valve as a vapor
B.suction service valve as a liquid
C.discharge service valve as a vapor
D.charging valve as a liquid
第9题：
cooling the gas below the ignition point
cutting off the supply of oxygen
stopping the flow of gas
interrupting the chain reaction
第10题：
too much refrigerant in the system
oil entrained in the refrigerant
less than a full charge of refrigerant in the system
ice crystals forming in the refrigerant