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【单选题】
光合作吸吸收CO 2 等于呼吸作用释放的CO 2 时的外界CO 2 浓度称为( )。A.
O\r\n 2 \r\n饱和点
B.
CO\r\n 2 \r\n补偿点
C.
CO\r\n 2 \r\n饱和点
D.
光饱和点
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举一反三
【单选题】Why did the author offer the AIDS course?
A.
He wanted to teach people about a cure for AIDS.
B.
People need to be taught how to avoid those with AIDS.
C.
He wanted to teach the students that AIDS resulted from moral failure.
D.
People take improper attitudes towards AIDS and those with or at high risk of AIDS,
【简答题】
【单选题】What can be inferred from the passage about AIDS vaccine?
A.
In the near future AIDS vaccines will be found.
B.
The time is ripe for experts to find AIDS vaccines.
C.
AIDS vaccines are difficult, if not impossible, to find.
D.
AIDS vaccines failures were due to the trials on animals.
【单选题】Most people in the USA believe that______.
A.
AIDS is no longer an epidemic
B.
AIDS is killing more people than before
C.
there is still no cure for AIDS
D.
advances have been made in treating AIDS
【简答题】三相异步电动机转速公式?调速方式有哪几种?
【单选题】The third reason for AIDS education is _____________.
A.
to reduce the fear of HIV and AIDS
B.
to bring down the death rate of AIDS
C.
to prevent the spread of HIV
D.
to protect HIV-positive people or AIDS patients
【简答题】何谓三相异步电动机的调速？鼠笼式异步电动机的调速方法有哪些？
【简答题】A．To investigate the causes of . B．To raise money for patients. C．To rally support for victims' in Africa. D．To draw attention to the spread of in Asia.
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