单项选择题

Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?（）

A.Latent heat of vaporization
B.Heat of compression
C.Superheat
D.All of the above

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单项选择题

Which of the following factors will have the greatest effect on the heating load within a conditioned space?（）

A.Solar gain
B.Infiltration and ventilation air
C.Occupants inside the space
D.Entertainment equipment within the space

单项选择题

Which of the following statements represents the advantage of rotary pumps as compared to reciprocating pumps?（）

A.The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pump
B.Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weight
C.Rotary pumps occupy only one-half the space of reciprocating pumps
D.Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump

单项选择题

If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.

A.misalignment or worn main bearings
B.insufficient cylinder lubrication
C.defective or poorly fitted valves
D.all of the above