单项选择题
The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the（）
A.manifold B.condenser C.chamber D.plenum
单项选择题 If a compressor runs continuously, the cause might be a（）
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:（）
