Clouds are classified according to their（）.

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• In many areas “atoll” clouds (clouds of vertical development) are produced over small islands. These are the result of（）.

  A . rising air currents produced by the warm islands B . warm air from the sea rising over higher land areas C . cool land air mixing with warm sea air D . descending air over the island

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• Fires involving combustible metals are classified as （）.

  A . class "A" fires B . class "B" fires C . class "C" fires D . class "D" fire

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• Altocumulus clouds are defined as（）.

  A . high clouds B . middle clouds C . low clouds D . vertical development cloud

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• High clouds，composed of small white flakes or scaly globular masses，and often banded together to form a mackerel sky，would be classified as（）.

  A . cirrus B . cirrocumulus C . altostratus D . cumulonimbu

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• The gear and screw pumps are classified as （）.

  A . variable stroke pumps B . multistage pumps C . positive displacement pumps D . triple-ported pum

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• Fires occurring in combustible metals, such as sodium or magnesium, are classified as a （）.

  A . class A B . class B C . class C D . class D

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• The eye of a hurricane is surrounded by dense black cumulonimbus clouds which are called the（）.

  A . Wall cloud B . Nimbostratus cloud C . Bar D . Funnel

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• The gear, screw, and vane pumps are all classified as （）.

  A . variable stroke pumps B . multistage pumps C . positive displacement pumps D . triple-ported pum

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• All diesel engines are classified as（）.

  A . four cycle B . compression ignition C . vacuum ignition D . external combustio

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• All of the following are associated with cumulonimbus clouds EXCEPT（）.

  A . steady rainfall B . hail storms C . thunderstorms D . tornadoes or waterspout

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• A line of clouds，sharp changes in wind direction，and squalls are most frequently associated with a(n)（）.

  A . occluded front B . warm front C . cold front D . warm sector

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• DC generators are classified according to the manner in which（）

  A . they are used B . the field windings are connected to the load C . the armature circuit is connected to the load D . the field windings are connected to the armature circuit

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• Cirrus clouds are composed primarily of（）.

  A . ice crystals B . water droplets C . snow crystals D . nitroge

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• Clouds that form as small white flakes or scaly globular masses covering either small or large portions of the sky are（）.

  A . cirrus B . cirrostratus C . altostratus D . cirrocumulu

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• 105. Clouds are classified according to their ______.

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• Products are classified into and industrial products.

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• In Beijing Opera, characters are classified according to sex

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• Chinese characters are generally classified into four categories and they are pictographic characters, ideographic characters, associative characters and ____.

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• Antonyms are classified on the basis of _____.

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• Clouds that form. as small white flakes or scaly globular masses covering either small or large portions of the sky are ().

  A.Cirrus B.Cirrostratus C.Altostratus D.Cirrocumulus

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• It is going to rain soon, as there are dark clouds _________ our heads.

  A、on B、beyond C、far from D、over

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• Liabilities that are required to be paid within a year are classified as current liab

  是 否

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• Vowel sounds are classified by a number of factors: the position of the tongue in the

  是 否

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• What are the ideal conditions for creating clouds？

  A．The temperature is as low as minus 235 degrees Fahrenheit. B．The air is a million times drier than that of Sahara. C．Extremely dry air and low enough temperature. D．A mild climate and the build-up of carbon dioxide.

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