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【简答题】
将 转换成 的装置称为电源;将 转换成 的元器件或设备称为负载。 (参考词汇: 其他形式的能 电能)
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【单选题】Federal officials should consider reopening public access to about three dozen Web sites withdrawn from the Internet after the Sept. 11, 2001, attacks, a government-financed study says, because the si...
A.
36
B.
24
C.
48
D.
18
【单选题】Thailand confirmed three new human bird flu cases Thursday as health officials warned it could take two years to conquer Asia's outbreak. Meanwhile, the World Health Organization said the latest tests...
A.
It could take two years to conquer Asia's outbreak of bird flu.
B.
The bird flu is dangerous because it is very easy to spread between people.
C.
The best way to control the spread of the bird flu is by killing the infected birds.
D.
The outbreak of bird flu is hard to control because the genes of the bird flu strain and human flu are mixing very quickly.
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