A.stop valves
B.check valves
C.safety valves
D.reducing valves
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A.an electric motor
B.a diesel engine
C.a compressor
D.oil
A.large size of oil globule
B.low temperature
C.high viscosity
D.high flow rate
A.with dirty water
B.with clean water
C.by oily water
D.by mixed water
A.upwards
B.downwards
C.outwards
D.forwards
A.bowl periphery
B.bowl center
C.upper surface
D.lower surface
最新試題
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
A salinity indicator is used to determine the （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
Which of the following statements is correct concerning heat transfer?（）
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
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?（）
A grease gun is generally used to lubricate a （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.