單項(xiàng)選擇題

The purpose of the low pressure cut-out switch is to （）.

A.maintain liquid refrigerant at the suction of the compressor
B.maintain a preset suction pressure to the compressor
C.start and stop the compressor at preset operating pressures
D.operate at minimum efficiency

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單項(xiàng)選擇題

The process of boiling seawater in order to separate it into freshwater vapor and brine is usually defined as （）.

A.dehydration
B.condensation
C.evaporation
D.dissolution

單項(xiàng)選擇題

In the production of freshwater from seawater through a process of heating and cooling, the cooling phase of production is usually called （）.

A.evaporation
B.distillation
C.dehydration
D.condensation