药物与毒物之间没有绝对的界限,在一定条件下可以相互转化。
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药物对机体的作用属于药物代谢动力学研究的内容
A. 对
B. 错
What are the two new forms of music developed by the musicians in the southern United States?
A. Jazz
B. The blues
Country music
D. R&B
The text is mainly about _____.
A. the life of Elvis Presley
B. the history of American music
C. the development of rock and roll
D. black Africans and white European music
为了保证汽车安全行驶,提高汽车的平均行驶车速,以提高运输生产率,在各种汽车上都设有专用制动机构。这样的一系列专门装置即称为制动系。
A. 对
B. 错