A.fresh water
B.fresh air
C.salt water
D.artificial respiration
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A.rub the eyes
B.irritate the eyes
C.wash the eyes with a heavy boric acid solution
D.obtain medical help
A.Refrigeration
B.Air conditioning
C.Ventilation
D.Heating
A.Refrigeration
B.Air conditioning
C.Ventilation
D.Heating
A.increase；reduce
B.reduce；increase
C.increase；increase
D.reduce；reduce
A.instantaneous
B.instantaneously
C.simultaneous
D.simultaneously
最新試題
A grease gun is generally used to lubricate a （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
A pressure drop through the refrigerant liquid line may cause （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
When the steering gear is in operation, you should （）.
Which of the listed pumps is NOT a positive displacement pump?（）
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.