The pressure head of a pump is given in the unit of （）.
In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modem low pressure air compressors?（）
You download a file from an FTP site on the Internet. What is the highest layer in the OSI model used in this FTP operation?（）
The weather is often（）in a high-pressure area.
The atmosphere in the vicinity of a high pressure area is called a(n)（）.
Compared to a low pressure system，generally the air in a high is（）.
In the Southern Hemisphere winds in a low pressure system rotate in a（）.
In a vacuum distillation system, the case is the higher the pressure, （）.
In an auxiliary boiler steam and water system, the highest pressure will be in the （）.
In a compression refrigeration plant the refrigerant is under low pressure in the （） and under high pressure in the （）.
Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the （）.
If a large difference exists between the compressor discharge pressure and the pressure corresponding to the existing condensing temperature in a refrigeration system, you should（）.
A slow rise in the barometric pressure forecasts（）.
The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.
In which of the areas listed would you expect to find the highest salt concentration in a flash evaporator?（）
When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the oil （）.
The pressure head of a water pump is given in the unit of （）.
A（）is created by a pressure gradient or slope in the water level.
A pressure drop in the liquid line of a refrigeration system may cause（）
Meng Jiao ( 孟郊 ), a poet who lived in the Tang dynasty, passed the highest imperial examination right after his first attempt.
The atmosphere in the vicinity of a high pressure areas is called a (n) _____.
The metal powder is compacted by placing in a closed（)cavity under pressure in powder
The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as_______.
4、翻译句子，注意斜体字的词类转换。 A continuous increase in the temperature of a gas confined in a container will lead to a continuous increase in the internal pressure within the gas.
