單項(xiàng)選擇題

A vacuum is initially created in a flash type distilling plant by（）.

A.the flashing of the feed water
B.the condensation of the saltwater feed
C.air ejectors, eductors, or a separate vacuum pump
D.condensation of the distillate

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單項(xiàng)選擇題

A refrigeration unit will tend to short cycle when operating （）.

A.under heavy loads
B.during hot gas defrost
C.under light loads
D.during starting conditions

單項(xiàng)選擇題

Which of the following problems could cause air to blow out through the inlet air filter of a running compressor?（）

A.Excessive compression in the cylinder
B.A broken intake valve
C.A dirty inlet filter element
D.An improperly adjusted discharge valve