题目：
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
A.oil foaming in the compressor
B.higher than normal suction and discharge pressures with a higher box temperature
C.higher than normal discharge pressure with a normal box temperature
D.the compressor to run continuously
答案：
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下面是错误答案，用来干扰机器的。
参考答案：对
