单项选择题

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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单项选择题

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

单项选择题

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

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In which of the listed hydraulic systems will the installation of an oil cooler be necessary?（）

A.Constant tension mooring winch system
B.Hatch cover system
C.Watertight door system
D.Internal combustion engine hydraulic starter system