单项选择题
Which of the following statements is true concerning centrifugal pumps?（）
A.They are particularly suited for pumping high viscosity fluids
B.They are started with the discharge valve opened
C.The flow of liquid is developed by imparting energy due to the rotation of an impeller
D.They are always mounted in a horizontal position
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相关考题
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单项选择题
The temperature of the refrigerant in the evaporator coil depends mostly upon the （）.
A.refrigerant pressure in the evaporator
B.cooling water temperature to the condenser
C.heat load in the refrigerator compartment
D.solenoid valve in the liquid line -
单项选择题
Refrigerant is circulated through a refrigeration system by the （）.
A.compressor
B.condenser
C.expansion valve
D.evaporator -
单项选择题
The type of gauge most commonly used to measure pressure is the （）.
A.bimetallic type
B.diaphragm type
C.bourdon tube type
D.resistance-temperature type
