单项选择题
If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the （）.
A.system was overcharged with refrigerant B.high pressure switch was improperly adjusted C.expansion valve strainers were fouled D.suction valves were leaking slightly
单项选择题 If the pump for a hydraulic anchor windlass is over heating, the cause may be （）.
单项选择题 Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）
单项选择题 Broken valve strips in an operating low pressure, air compressor will cause （）.
