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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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
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