A.a needle gun
B.soap and water
C.a wire brush
D.a chipping hammer
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A.Hydrochloric acid
B.Chlorine
C.Sulfuric acid
D.Zinc chromate
A.absolute humidity
B.relative humidity
C.specific humidity
D.total humidity
A.excessive pump speed
B.excessive suction head
C.worn wearing rings
D.gross pump misalignment
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
A.absolute humidity
B.specific humidity
C.effective humidity
D.relative humidity
最新試題
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
A salinity indicator is used to determine the （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
The general purpose of a heat exchanger is to （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
The major source of chemical contaminants in hydraulic fluid is （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.