你可能感興趣的試題

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

單項選擇題

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