单项选择题
Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to （）.
A.maintain adequate coil back pressure
B.prohibit flashing in the liquid line
C.reduce refrigerant volume in the system
D.reduce compressor discharge line loading
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单项选择题
An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of （）.
A.maintaining a steadier speed
B.delivering liquids over greater distances
C.operating for longer periods of time
D.producing a smoother discharge flow -
单项选择题
The size of ball and roller bearings can be identified by the （）.
A.rolling member size
B.inner race cone width
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A centrifugal pump produces flow with a resulting discharge head by energy conversionIt is typical for the energy conversion to follow the order of （）.
A.mechanical energy to kinetic energy to potential energy
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D.kinetic energy to mechanical energy to potential energy
