A.compressor
B.condenser
C.throttle valve
D.evaporator
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A.open-type
B.hermetic
C.semi-hermetic
D.all the above
Which of the following will be desirable properties of refrigerant?（）
(1) non-explosive
(2) non-corrosive
(3) that it doesn’t react with lubricants
A.(1), (2) and (3)
B.(1) and (2)
C.(1) and (3)
D.(2) and (3)
A.saturated
B.super-cooled
C.wet
D.superheated
A.extracts
B.releases
C.gives no
D.absorbs no
A.vapor
B.liquid
C.solid
D.None of the above is tree
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An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
A salinity indicator is used to determine the （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
A salinity indicator is used to determine the （）.
A grease gun is generally used to lubricate a （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
When the steering gear is in operation, you should （）.
The major source of chemical contaminants in hydraulic fluid is （）.