单项选择题
If a compressor runs continuously, the cause might be a（）
A.defective thermal bulb B.clogged scale trap C.stuck high-pressure switch D.stuck low-pressure switch
单项选择题 Which of the following would not cause high suction pressure?（）
单项选择题 If the high-pressure switch on the compressor opens and stops the compressor a possible cause could be:（）
单项选择题 The scale trap is located between the （）
