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A generally circular low pressure area is called a(n)______．
A.cyclone
B.anticyclone
C.cold front
D.occluded front
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更多 “ A generally circular low pressure area is called a(n)______．A.cycloneB.anticycloneC.cold frontD.occluded front ” 相关考题
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单选题Generally speaking，you should expect to find low atmospheric pressure prevailing in the earth’s（）.A
equatorial areaB
polar regionsC
mid-latitudesD
All of the above
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单选题The device used for low-pressure control and high-pressure cutout on a compressor is called a（）A
cutoutB
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tidal wavesC
tropical wavesD
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Hill of low pressureB
Trough of low pressureC
Valley of low pressureD
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单选题Compared to a low pressure system，generally the air in a high is（）.A
warmer，less dense，and less stableB
cool，more dense，and drierC
muggy and cloudyD
extremely moist with high relative humidity
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单选题The atmosphere in the vicinity of a high pressure area is called a(n)（）.A
anticycloneB
cold frontC
occluded frontD
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单选题Which of the following statements is true concerning the overall efficiency of air compressors?（）A
High pressure compressors are more efficient than low pressure compressorsB
Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unitC
Two stage compressors are generally more efficient than single stage compressorsD
The volumetric efficiency is decreased in multistage compressors
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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 （）.A
dump valveB
deflectorC
separatorD
diverter
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单选题Wen a hurricane passes over colder water or land and loses its tropical characteristics，the storm becomes a（n）（）.A
High pressure areaB
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单选题An air mass is termed warm if（）.A
it is above 70°FB
the ground over which it moves is cooler than the airC
it originated in a high pressure areaD
it originated in a low pressure area
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单选题A generally circular low pressure area is called a(n)（）.A
cycloneB
anticycloneC
cold frontD
occluded front
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单选题The direction of the surface wind is（）.A
directly from high pressure toward low pressureB
directly from low pressure toward high pressureC
from high pressure toward low pressure deflected by the earth's rotationD
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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?（）A
DifferentialB
TrunkC
BarrelD
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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?（）.A
East to northeastB
East to southeastC
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单选题Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.A
globe valvesB
butterfly valvesC
gate valvesD
reducing valves
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单选题The diurnal variation of pressure is most noticeable（）.A
above the polar circlesB
in a low pressure areaC
during periods of low temperaturesD
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单选题A katabatic wind blows（）.A
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in a circular patternC
down an incline due to cooling of the airD
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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（）.A
prevailing westerliesB
geostrophic windsC
doldrumsD
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单选题Considering the general circulation of the atmosphere，the wind system between latitudes 30°N and 60°N is commonly called the（）.A
prevailing westerliesB
horse latitudesC
trade windsD
subpolar low pressure belts
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