單項(xiàng)選擇題

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

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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

單項(xiàng)選擇題

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