單項選擇題

Which of the following best describes “overcharge of refrigerant”?（）

A.Too much refrigerant
B.Too little refrigerant
C.Refrigerant is ran out
D.Running is over

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單項選擇題

The presence of air in the condenser of a refrigeration system will （） the condensing pressure.

A.increase
B.reduce
C.maintain constant
D.None of the above is true

單項選擇題

Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant? （）
(1) too little cooling water
(2) too much cooling water
(3) too warm cooler water

A.（1）only
B.anyof（1），（2）and（3）
C.anyof（1）and（3）
D.anyof（1）and（2）