皮皮学，免费搜题
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【多选题】
关于HBV哪些描述正确A.
可致持续性感染
B.
与原发性肝癌有关
C.
可垂直传播
D.
预防乙型肝炎最有效的方法是接种乙肝疫苗
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举一反三
【单选题】关于滚柱式单向离合器的工作原理,下列描述错误的是:
A.
起动时,电动机带动十字块旋转,滚柱滚至楔形较浅端并和外壳紧密接触。
B.
起动完成后,在发动机齿圈的带动下,驱动齿轮的转速快于十字块。
C.
起动完成后,在外壳的带动下,滚柱滚至楔形较深端直至与外壳脱离。
D.
起动时和起动完成后,单向离合器外壳的旋转方向发生了变化,因此称为单向离合器。
【单选题】What was the effect of Roots?
A.
It had great effect on the black power movement in the US.
B.
People didn't believe the book was about a true story.
C.
It became a bestseller all over the world at once．
D.
The book was a great success and won Haley money and prizes.
【单选题】Which of the following best describes the organization of the first two paragraphs of the passage?
A.
An argument is made, then complicated through the admission of the argument's limitation.
B.
The general nature of a problem is presented, followed a concrete example of the problem.
C.
A thesis is stated, and evidence is provided along with an analysis to support the thesis.
D.
The method of research in a field of science is explained, than illustrated through a specific case.
E.
Two opposing methods of the best means to perform. a science are explained, then shown to reconcilable.
【简答题】What kind of arrangement effect makes the reader feel upset?
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