单项选择题
Which of the following would not cause high suction pressure?（）
A.insufficient refrigeration B.leaky suction valves C.expansion valve stuck open D.suction valve not adjusted properly
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 （）
单项选择题 The relief valve is located on the（）
