單項選擇題The steam coils in a high pressure evaporator used for saltwater service should be de-scaled with （）.
A.a needle gun
B.soap and water
C.a wire brush
D.a chipping hammer
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1.單項選擇題Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?（）
A.Hydrochloric acid
B.Chlorine
C.Sulfuric acid
D.Zinc chromate
2.單項選擇題The ratio of the weight of moisture contained in a given volume of air, to the weight of moisture that the same sample would hold if saturated, is called the（）.
A.absolute humidity
B.relative humidity
C.specific humidity
D.total humidity
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If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
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If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
題型：單項選擇題
A salinity indicator is used to determine the （）.
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Which of the listed pumps is NOT a positive displacement pump?（）
題型：單項選擇題
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
題型：單項選擇題