A cloud of marked vertical development (often anvil-shaped) would be classified as（）.

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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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• Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.

  A . clearing weather B . that a warm front has passed C . probable thunderstorm activity D . an approaching hurricane or typhoo

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• On a clear，warm day，you notice the approach of a tall cumulus cloud. The cloud top has hard well defined edges and rain is falling from the dark lower edge. Should this cloud pass directly overhead（）.

  A . it will be preceded by a sudden increase in wind speed B . it will be preceded by a sudden decrease in wind speed C . the wind speed will not change as it passes D . the wind will back rapidly to left in a counterclockwise direction as it passe

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• A sign of thunderstorm development is a cumulus cloud（）.

  A . darkening，growing in size and forming an anvil top B . that shows extensive vertical development C . creating cold downdrafts that are felt on the ground D . All of the above

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• The vertical movement of a vessel in the water is called（）.

  A . pitch B . sway C . heave D . roll

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• （）is a silvery cloud in the front of feathers or fibres seen high up against a blue sky.

  A . Cirrostratus B . Cirrus C . Cirrocmulus D . Altostratu

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• A vessel showing a green light over a white light in a vertical line above the level of the sidelights is（）.

  A . engaged in underwater construction B . under sail and power C . a pilot vessel D . trawling

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• A vertical shife of weight to a position above the vessel''s center of gravity will（）.

  A . increase reserve buoyancy B . decrease the righting moment C . decrease KG D . increase KM

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• Angular motion about the vertical axis of a vessel is called（）.

  A . yaw B . surge C . sway D . roll

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• The inner cloud bands of a hurricane，when viewed from a distance，form a mass of dense，black cumulonimbus clouds called the（）.

  A . bar of the storm B . eye of the storm C . funnel D . front

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• The presence of stratus clouds and a dying wind will usually result in（）.

  A . heavy rain B . heavy snow C . thick fog D . clearing skie

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• From which type of cloud can a tornado or waterspout develop?（）

  A . Nimbostratus B . Altostratus C . Cumulonimbus D . Cirru

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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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• The height of a wave is the vertical distance（）.

  A . from the still water plane to the crest B . from the still water plane to the trough C . from crest to trough D . between water levels at one-quarter of the wave's length

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• “A centrifuge consists of an electric motor driving a vertical shaft on the top of which is mounted the bowl assembly”.According to this sentence, we can know that is mounted on the top of the vertical shaft（）

  A . a centrifuge B . an electric motor C . a bowl assembly D . a driving motor

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• A cloud sequence of cirrus，cirrostratus，and altostratus clouds followed by rain usually signifies the approach of a(n)（）.

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

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• The vertical distance between G and M is used as a measure of（）.

  A . stability at all angles of inclination B . initial stability C . stability at angles less than the limit of positive stability D . stability at angles less than the downflooding angle

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• A cloud of marked vertical development (often anvil-shaped) would be classified as ______.

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• 34.In most cases, a shipping mark consists of the name of the consignee or shipper and packaging number, but not of the destination mark.

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• Mark's Markers, a manufacturer of white board markers, has required its dealers to charge a specified retail price for its markers. Mark's is most likely guilty of ________.

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• sel is vertically aligned with the ______．◑A.longitudinal centerline◑B.center of flotation◑C.original vertical centerline◑D.metacenter

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• What is the definition of a path？ （)A．A sequence of vertices and the edges formed by each

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• From Dr. R. S. Scorer of Britain’s Imperial College of Science comes the latest theory about the cause of lightening flashes. Dr. Scorer believes the cause is hail falling through super - cooled clouds, lee particles bouncing off the falling hail acquire a positive charge and rise to the top of the cloud while the hail carries a negative charge to the bottom of the cloud.

  According to Dr. Scorer, Benjamin Franklin first proved thunderclouds are charged with electricity. Later investigation showed that the tops of the clouds have a great positive charge and the bottoms a great negative charge. When the charges become great enough to break down the insulating properties of the air, lightening flashes carry the electricity within the cloud, or from cloud to cloud, or from cloud to earth. But the question remained: how do the charges develop within the cloud？ To seek the cause, Dr. Scorer and his colleagues at the college first duplicated thundercloud currents in a liquid tank. They doubt that mixture takes place only in the tops of the clouds. Next a study of thunderclouds over the North Atlantic showed that lightening occurs only when the air temperature around the cloud is below freezing. Particles at the top of the cloud begin to freeze, but those in the remainder of the cloud stay unfrozen although below freezing temperature. To measure moisture, the scientists sent planes equipped with external refrigerated rods into the clouds. The idea was that moisture would freeze on the rods and could later be measured. The men found, however, that some of the moisture particles bounced off the rods. This accidental discovery set the scientists on a new course of action. In the laboratory, S. E. Reynolds whirled a refrigerated rod through ice particles and found that the particles bounced off the rod acquired a positive charge. This was the missing link. Without hail and super-cooled clouds, he concluded there could be no lightening. According to the article, Benjamin Franklin was the first to prove that _______. A．lightening is caused by hail falling through super - cooled clouds B．thunderclouds are not charged with electricity C．thunderclouds are charged with electricity D．lightening was not an invention of the devil

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• Cloud computing is a style of computing in which dynamically scalabled of ten（72）resources are provided as a service over the internet.

  A．real B． fixed C． actual D． virtualized

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