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Cumulonimbus clouds can produce ______.
A.dense fog and high humidity
B.gusty winds, thunder, rain or hail, and lighting
C.clear skies with the approach of a cold front
D.a rapid drop in barometric pressure followed by darkness
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increasing cloud cover lasting for several daysC
lengthy wet weatherD
low ceilings with thick cirrus clouds
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单选题All of the following are associated with cumulonimbus clouds EXCEPT（）.A
steady rainfallB
hail stormsC
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单选题The dense black cumulonimbus clouds surrounding the eye of a hurricane are called（）.A
Spiral rainbandsB
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vertical air movementsB
heavy rainstormsC
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单选题Cumulonimbus clouds can produce（）.A
dense fog and high humidityB
gusty winds，thunder，rain or hail，and lightningC
clear skies with the approach of a cold frontD
a rapid drop in barometric pressure followed by darkness
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using a 2-1/2 inch hoseB
there is an outlet for the smoke and heatC
the fire is totally contained by the ship's structureD
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单选题Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.A
clearing weatherB
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单选题High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.A
many thousand timesB
between timesC
one timeD
at times
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