皮皮学，免费搜题
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【单选题】
对于光敏电阻,下列说法 不正确的 是( )A.
弱光照下，光电流与照度之间具有良好的线性关系
B.
光敏面作成蛇形，有利于提高灵敏度
C.
光敏电阻具有前历效应
D.
光敏电阻光谱特性的峰值波长，低温时向短波方向移动
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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.
【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？
【单选题】甾体母核中的手性碳原子为
A.
C5,C8,C11,C13,C14,C17
B.
C5,C6,C8,C9,C13,C14
C.
C5,C6,C8,C9,C13,C14
D.
C5,C8,C9,C10,C13,C14
E.
C5,C8,C9,C10,C13,C17
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