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- 3如何鉴别1-丁炔与2-丁炔?
- 4like exercise a lot=like exercise very much吗?
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- 6相对于反向的光,我们是以光速在运动吗?
- 7I don't know what to say sorry that
- 8已知tan(π-α)=2计算[3sin^2(π-α)-2cos^2(3π-α)+sin(3π/2-α)]/1+2sin^2α+cos^2α
- 9形容专心的四字成语
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