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- 3手电筒照射出的光可以被镜子无限反射,然后无限增强吗?
- 4a+b=-3,a2-b2=6,则a-b=_;若b-c=2,则代数式1/2b2−bc+1/2c2的值是_.
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- 6《梅》的诗意 ( 宋)王安石
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- 8what will you do if you get lost?要怎么回答
- 9This kind of machine _____ a big factory
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