單項(xiàng)選擇題

Which cause of following will not lead to refrigeration plant short-cycle?（）

A.lack of refrigerant
B.refrigerant with much water
C.set defectively low pressure relay
D.no cooling water

你可能感興趣的試題

On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）

A.centrifugal pump is cheaper than reciprocating pump
B.the size of centrifugal pump with same capacity is smaller than that of reciprocating pump
C.centrifugal pump makes maintenance easier than reciprocating pump does
D.all of the above

單項(xiàng)選擇題

When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will（）

A.rise quickly
B.rise slowly
C.drop quickly
D.drop slowly