A.should be paved
B.should be cleaned
C.should be dismantled
D.should be welded
您可能感興趣的試卷
你可能感興趣的試題
A.fulfill
B.eliminate
C.grease
D.bend
A.Condenser and thermal expansion valve
B.King and solenoid valves
C.Compressor and thermal expansion valve
D.Condenser and solenoid valve
A.Too much refrigerant
B.Too little refrigerant
C.Refrigerant is ran out
D.Running is over
A.increase
B.reduce
C.maintain constant
D.None of the above is true
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）
最新試題
The output volume of a positive fixed displacement pump can be changed only by （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
When the steering gear is in operation, you should （）.