單項(xiàng)選擇題Freon 12 which is used to produce intense cold is normally a () when at atmospheric pressure and temperature.

A.liquid
B.gas
C.solid
D.water only


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2.單項(xiàng)選擇題The shutter of the evaporator was blocked with (), it means there was too much evaporation.

A.ice
B.wooden board
C.iron plate
D.cotton waste

3.單項(xiàng)選擇題The inner part of the condenser should be cleaned with ().

A.gas oil
B.diesel oil
C.chemical compound
D.Freon-12

4.單項(xiàng)選擇題In the cargo winch, spur reduction gearing transfers the motor drive to ().

A.the toping light
B.the board brake
C.the fail-safe
D.the barrel shaft