单项选择题
A.temperature B.pressure C.velocity D.heat
Faulty operation of any system is indicated by very def...
单项选择题Faulty operation of any system is indicated by very definite （）.
A.symptoms B.samples C.traces D.tracks
The refrigerating agent can （） at low temperature in th...
单项选择题The refrigerating agent can （） at low temperature in the evaporator.
A.expand B.evaporate C.condense D.distil
Because the expansion valve is just （） way open, the re...
单项选择题Because the expansion valve is just （） way open, the refrigerant is under low pressure in the evaporator.
A.little B.few C.a little D.a few
