The explosive growth in casinos is one of the most conspicuous signs of Westernization.()
The explosive growth in casinos is one of the most intelligible signs of Westernization.()
The explosive growth in casinos is one of the most () signs of Westernization.
A.dim
B.obscure
C.conspicuous
D.intelligible
A.ammunitions
B.explosive
C.corrosive
D.radioactive
A.poisonous articles
B.radioactive articles
C.explosive article
D.inflammable article
A.quarreling becomes inevitable
B.it is not longer a conflict between two individuals
C.people begin to hate each other
D.no solution is possible
此题为判断题(对,错)。
A sound is a pressure disturbance: a sonic boom, like other explosive sounds, is the result of an abrupt change in pressure. An airplane in subsonic flight produces weak changed in pressure, but because these disturbances travel at the speed of sound, they move faster than the airplane and stay in front of it. In effect, these disturbances warn the air to get out of the way, and the an does just jet, however, gets ahead of its own pressure disturbances. Consequently a wave of suddenly com pressed air--a shock wave--builds up and is thrown off like the wave ;hat spreads from the bow of a speedboat.
Can sonic booms be eliminated? The answer is a categorical negative--they are an innerent(内在的) part of supersonic flight--but the sonic boom probably can be reduced; government and private research is now under way to improve understanding of the sonic boom. If and when the booms can be reduced to tolerable levels, commercial supersonic transports can come rata service.
Before commercial airliners travel faster than sound, problems must 0e solved regarding ______.
A.design
B.Construction
C.operation
D.all of the above
Almost every new innovation goes through three phases. When
initially introducing into the market, the process of adoption is slow. S1.______
The early models are expensive and hard to use, and perhaps even unsafe.
The economic impact is relatively great. S2.______
The second phase is the explosive one, where the innovation was S3.______
rapidly adopted by a large number of people. It gets cheaper and easier
to use and becomes something familiar. And then in the third stage, diffusion
of the innovation slows down again, as if it permeates out across the S4.______
economy. During the explosive phase, the whole new industries
spring up to produce the new product or innovation, but to service it. S5.______
For example, during the 1920s, there was a dramatic acceleration in auto
production, from 1.9 million in 1920 to 4.5 million in 1929. This boom was
accompanying by all sorts of other essential activities necessary for S6.______
auto-based nation: Roads had to be built for the cars to run on; refineries and S7.______
oil wells, to provide the gasoline; and garages, to repair it. Historically, the S8.______
same pattern is repeated again and again with innovations. The construction
of the electrical system requested an enormous early investment in generation S9.______
and distribution capacity. The introduction of the radio was followed by a buying
spree(无节制的狂热行为) by Americans what quickly brought radios into S10.______
almost half of all households by 1930, up from nearly none in 1924.
【S1】