單項選擇題Which of the following statements is correct relative to distillation plant operation?()

A.Distillation is the process of boiling seawater to produce vapor which is condensed into fresh water
B.Evaporation is the second part of the distillation process where brine is removed
C.Brine is the result of condensed sea water vapor
D.Distillate is the product resulting from the evaporation of fresh water vapor


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2.單項選擇題The purpose of an air compressor unloading device is to ()

A.drain water from the air receiver
B.drain water from the cylinders
C.delay the compression process until the motor is up to speed
D.check pump alignment

3.單項選擇題Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear ().

A.face shield
B.a respirator
C.rubber gloves
D.an all purpose gas mask

5.單項選擇題If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the ().

A.packing gland
B.mechanical seals
C.lantern rings
D.wearing rings