A.little
B.few
C.a little
D.a few
您可能感興趣的試卷
你可能感興趣的試題
A.liquid
B.oily mixture
C.emulsion
D.vapor
A.liquid
B.gas
C.solid
D.water only
A.balance
B.not balance
C.be more than
D.be less than
A.ice
B.wooden board
C.iron plate
D.cotton waste
A.gas oil
B.diesel oil
C.chemical compound
D.Freon-12
最新試題
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
A salinity indicator is used to determine the （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
The major source of chemical contaminants in hydraulic fluid is （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
A grease gun is generally used to lubricate a （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.