动脉粥样硬化导致的脑血栓形成,最常闭塞的血管发生在()
A.大脑前动脉
B.大脑后动脉
C.小脑上动脉
D.颈内动脉和大脑中动脉
E.基底动脉
参考答案:D
a是b的一个平方根,则b的平方根是( )
A.a
B.-a
C.±a
D.a2
将所给单词连成完整、正确的句子,(单词不得重复使用,标点已给出)。
1. a, pal, pen, have, in, I, Canada.
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2. can, he, some, English, speak,.
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3.he, English, often, me, helps, my, with
4. my, in, father, office, works, an
5. you, would, have, like, dinner, to, me, with?
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