单项选择题
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
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
Continuous surging of turbocharger can be caused by（） ①crash stop of engine ②increased back pressure after T-Ch ③fouled or damaged turbine nozzle ring
A.all are correct
B.②and③are correct
C.none of the above is correct
D.①only is correct
