单项选择题
If a refrigeration compressor is short cycling on high head pressure, you should （）.
A.purge the condenser if the waterside is dirty B.check for proper water flow through the condenser C.increase the high pressure cutout setting D.reduce the cooling water flow
单项选择题 What color is used to indicate the last shot of anchor chain?（）
单项选择题 A vacuum is initially created in a flash type distilling plant by（）.
单项选择题 A refrigeration unit will tend to short cycle when operating （）.
