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圆针用于治疗:

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残疾收入保险是()。

A. 补偿型险种
B. 给付型险种
C. 两者都是
D. 两者都不是

在图像中分别表示:向一定量的硫酸钠溶液中滴加氯化钡溶液,溶液中有关物质质量的变化,正确的是()。

When Adam Smith spoke of the principle of the "invisible hand" , he meant that______.

A. the government regulates all firms in such a manner that the "social responsibility" of business is assured
B. the pursuit of one's own self-interest will lead to the best good for all
C. cooperation among producers is necessary to minimize losses
D. governmental intervention in the marketplace may be necessary to have steady growth in national output

脑桥中央髓鞘溶解症是由于()

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