A slow,gradual fall of the barometer indicates approaching().
A . gale force winds within 12 hours
B . blizzard conditions
C . deteriorating or unsettled weather
D . heavy,wind driven rai
时间:2022-09-23 16:42:10
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A . heavy rain within six hours
B . a decrease in wind velocity
C . a change in the present weather conditions
D . that fog will soon set i
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A . the four-way control valve failing to shift
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Which of the following words in bold is pronounced with a falling tone?
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A . high pressure system
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Read the sentence “The story is simple, the rhythm is slow, the characters are warm and humorous, the whole plot gives me a sense of being relaxed and healed” and pick up the best translation out of the following versions.
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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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Imposition of a discriminating duty belongs to the tariff rates falling into the Category of ().
A.general rates
B.preferential rates
C.advalorem duty rates
D.special duty rates
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Over a given period, the price of a commodity falls by 5.0% and the quantity demanded rises by 7.5%. The price elasticity of demand for the commodity is best described as:
A、elastic
B、inelastic
C、Perfectly elastic