[判断题]停炉后停止加药泵的运行，关闭连续排污门、加药门和取样门，对各下联箱进行一次排污。( )
A.正确
B.错误

[A] What route does HIV take after it enters the body to destroy the immune system
[B] How and when did the long-standing belief concerning AIDS and HIV crop up
[C] What is the most effective anti-HIV therapy
[D] How does HIV subvert the immune system
[E] In the absence of a vaccine, how can HIV be stopped[
F] Why does AIDS predispose infected persons to certain types of cancer and infections
In the 20 years since the first cases of AIDS were detected, scientists say they have learned more about this viral disease than any other.
Yet Peter Piot, who directs the United Nations AIDS program, and Stefano Vella of Rome, president of the International AIDS Society, and other experts say reviewing unanswered questions could prove useful as a measure of progress for AIDS and other diseases.
Among the important broader scientific questions that remain:
41. __________.
A long-standing belief is that cancer cel