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【判断题】
某集成运算放大器开环带宽为5Hz，由于其非常低，所以该运算放大器只能用于构成直流放大电路。A.
正确
B.
错误
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【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.