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【简答题】
根据计算机采用的电子元件,计算机经历了哪四个发展时代?
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皮皮学刷刷变学霸
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【简答题】. Birds in cities are damaging their health by trying to sing above the noise of life． New research shows that male birds are trying to compete against traffic and city sounds．They are now singi...
【单选题】Which of the following is discussed in the third paragraph?
A.
The same noise level produces a different effect on land and in the ocean.
B.
Different places may have different types of noises.
C.
The decibel is not a suitable unit for measuring underwater noise.
D.
Different ocean animals may have different reactions to noises.
【简答题】The government _____ air quality in areas from level one to five: excellent, fairly good,slightly polluted, poor and erous. A arranges B. classifies C. distributes D. divide...
【单选题】Scientists now tend to agree that the noise level for potential hearing loss begins at about 70 decibels. Some of them are very concerned because normal daily life often exposes people to noise levels...
A.
30 decibels
B.
70 decibels
C.
100 decibels
D.
none of the above
【简答题】Living on that island for three months an unforgettable experience for me. (be)
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