单项选择题
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A.refrigerant overcharge
B.overfeeding by the expansion valve
C.a restricted suction strainer
D.due to short cycling of the compressor
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When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
A.increase the amount of cooling water to the condenser
B.decrease the amount of cooling water to the condenser
C.add more refrigerant to the system
D.remove some refrigerant from the system
