A generally circular low pressure area is called a(n)______．A.cycloneB.anticycloneC.cold frontD.occluded front
A generally circular low pressure area is called a(n)______．
A.cyclone
B.anticyclone
C.cold front
D.occluded front
相关考题：
The region of high pressure extending around the Earth at about 35°N latitude is called the_____A.prevailing westerliesB.horse latitudesC.troposphereD.doldrums
A low pressure annular preventer which is used to direct flow of kick fluids away from the rig floor is called a ______.A.dump valveB.deflectorC.separatorD.diverter
Fog is most commonly associated with a(n) ______.A.warm front at nightB.low pressure areaC.anticycloneD.lack of frontal activity
When a hurricane passes over colder water or land and loses its tropical characteristics，the storm becomes a（n）______．A.High pressure areaB.Extratropical low-pressure systemC.Tropical stormD.Easterly wave
On the pole side of the trade wind belt，there is an area of high pressure with weak pressure gradients and light，variable winds．This area is called the ______．A.Prevailing westerliesB.Geostrophic windsC.DoldrumsD.Horse latitudes
A barometer showing falling pressure indicates the approach of a ______.A.high pressure systemB.low pressure systemC.high dew pointD.low dew point
An occluded front is caused by a(n) ______.A.low pressure areaB.high pressure areaC.area of calm airD.cold front overtaking a warm front
If your weather bulletin shows the center of a low pressure area to be 100 miles due east of your position, what winds can you expect in the Northern Hemisphere?______.A.East to northeastB.East to southeastC.North to northwestD.South to southeast
单选题Generally speaking，you should expect to find low atmospheric pressure prevailing in the earth’s（）.Aequatorial areaBpolar regionsCmid-latitudesDAll of the above
单选题The device used for low-pressure control and high-pressure cutout on a compressor is called a（）AcutoutBpressure controllerCcontroller switchDcutout switch
单选题Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.Apermanent wavesBtidal wavesCtropical wavesDtropical storms
单选题Two well-developed high pressure areas may be separated by a（）.AHill of low pressureBTrough of low pressureCValley of low pressureDRidge of low pressure
单选题Compared to a low pressure system，generally the air in a high is（）.Awarmer，less dense，and less stableBcool，more dense，and drierCmuggy and cloudyDextremely moist with high relative humidity
单选题The atmosphere in the vicinity of a high pressure area is called a(n)（）.AanticycloneBcold frontCoccluded frontDcyclone
单选题Which of the following statements is true concerning the overall efficiency of air compressors?（）AHigh pressure compressors are more efficient than low pressure compressorsBMechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unitCTwo stage compressors are generally more efficient than single stage compressorsDThe volumetric efficiency is decreased in multistage compressors
单选题A low pressure annular preventer which is used to direct flow of kick fluids away from the rig floor is called a （）.Adump valveBdeflectorCseparatorDdiverter
单选题Wen a hurricane passes over colder water or land and loses its tropical characteristics，the storm becomes a（n）（）.AHigh pressure areaBExtratropical low-pressure systemCTropical stormDEasterly wave
单选题An air mass is termed warm if（）.Ait is above 70°FBthe ground over which it moves is cooler than the airCit originated in a high pressure areaDit originated in a low pressure area
单选题A generally circular low pressure area is called a(n)（）.AcycloneBanticycloneCcold frontDoccluded front
单选题The direction of the surface wind is（）.Adirectly from high pressure toward low pressureBdirectly from low pressure toward high pressureCfrom high pressure toward low pressure deflected by the earth's rotationDfrom low pressure toward high pressure deflected by the earth's rotation
单选题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?（）ADifferentialBTrunkCBarrelDValve-in-head
单选题If your weather bulletin shows the center of a low pressure area to be 100 miles due east of your position，what winds can you expect in the Northern Hemisphere?（）.AEast to northeastBEast to southeastCNorth to northwestDSouth to southeast
单选题Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.Aglobe valvesBbutterfly valvesCgate valvesDreducing valves
单选题The diurnal variation of pressure is most noticeable（）.Aabove the polar circlesBin a low pressure areaCduring periods of low temperaturesDin the doldrums
单选题A katabatic wind blows（）.Aup an incline due to surface heatingBin a circular patternCdown an incline due to cooling of the airDhorizontally between a high and a low pressure area
单选题On the pole side of the trade wind belt，there is an area of high pressure with weak pressure gradients and light，variable winds. This area is called the（）.Aprevailing westerliesBgeostrophic windsCdoldrumsDhorse latitudes
单选题Considering the general circulation of the atmosphere，the wind system between latitudes 30°N and 60°N is commonly called the（）.Aprevailing westerliesBhorse latitudesCtrade windsDsubpolar low pressure belts