简述美国人口统计学家拉文斯坦提出的人口迁移法则。

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问题:

简述美国人口统计学家拉文斯坦提出的人口迁移法则。

考点:地球科学人文地理学人文地理学题库
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简述西方国家律师的地位和职能。

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  Ann comes from England. She’s English. She speaks English. She can also speak a little Chinese. She’s in Shanghai now. She’s studying(学习) in a middle school of Shanghai. She has classes on weekdays. On Sundays she often plays games with her Chinese friends. Her father is working in a factory near her school. He helps the Chinese workers to make nice watches. Ann and her father like Chinese food. And they like China and the Chinese people very much.

小题1:Which is right(正确的)?

A. Ann speaks little Chinese.    B. Ann is good at Chinese.

C. Ann can speak some Chinese.

小题2:   Can Ann’s father speak Chinese?

A. We don’t know.        B. Yes.           C. No.

小题3:   Ann has _______ classes on Sundays.

A.some                  B.no                        C.many

小题4:   Ann’s father works in a _______ factory.

A.bike                 B.watch                 C.food

小题5:   Does Ann’s father like China?

A. We don’t know.        B. Yes.           C. No.

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急性化脓性炎症浸润的细胞主要为()
结核病时浸润的细胞常为()
慢性肉芽肿性炎时可能出现()
寄生虫感染时较多的浸润细胞为()
慢性炎症灶中浸润的炎细胞多为()

A.淋巴细胞

B.嗜酸性粒细胞

C.单核细胞

D.中性粒细胞

E.多核巨细胞

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Berkson偏倚是指()

A.入院率偏倚

B.易感性偏倚

C.检出征候偏倚

D.志愿者偏倚

E.回忆偏倚

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关于脊髓外形,下列说法正确的是()。

A.脊髓和椎管等长

B.成人脊髓下端平对第1腰椎下缘

C.颈、胸和腰神经根形成马尾

D.脊髓下端变细为终丝

E.脊髓腹面有前正中沟,背面有后正中裂

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