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问题 单项选择题

用脑血流灌注显像诊断脑死亡，最特征的影像是什么（）

A.两大脑半球没有放射性分布

B.一侧大脑半球没有放射性分布

C.头皮不显影

D.两大脑半球放射性低下

E.上矢状窦显影

答案

参考答案：A

阅读理解

阅读理解。

     Look at this boy. He is an English boy. His first name is Alan. His last name is Brown.This is his school. His school ID card is 36872368. His teacher is Miss Black. She is a nice teacher. Look! What’s that? It’s backpack. It’s blue. It’s Alan’s backpack. His red jacket is in it. Where is his watch? Oh, Alan lost it this morning.

1. Alan’s family name is ______________.

2. Alan’s school ID card number is ______________.

3. The color of his backpack is _____________.

4. The color of his jacket is ______________.

5. Alan lost ______________ this morning.
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问答题 简答题

简述有效市场细分的标志。
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