单项选择题
An increase in the heat load to a refrigeration system will cause （）.
A.the suction pressure to decrease
B.the suction temperature to increase
C.increased ice formation on the evaporator coil
D.excessive short cycling of the compressor
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A.Lobe
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Which of the following statements is true concerning centrifugal pumps?（）
A.They are particularly suited for pumping high viscosity fluids
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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
