单项选择题
Moisture in a refrigeration system can cause （）.
A.freezing the expansion valve closed
B.corrosion of system piping
C.improper temperature regulation
D.all of the above
点击查看答案&解析
相关考题
-
单项选择题
When the propeller blades are integral with the hub, the propeller is called a （）.
A.built up propeller
B.solid propeller
C.controllable pitch propeller
D.suction back propeller -
单项选择题
The tendency of a flammable liquid to vaporize is indicated by its （）.
A.ignition temperature
B.flash point
C.flammable range
D.convection index -
单项选择题
Moisture in the refrigerant may （）.
A.freeze on the expansion valve seat and reduce the flow of liquid refrigerant
B.emulsify the oil in the condenser
C.freeze in the king valve
D.clog the oil trap
