i need you help

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i need you help
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i need you help
i need you help
 

i need you help
(2)铝在空气中极易生成氧化膜,往往是打磨完后20秒不到就可以再生一层.
（3）将铝片换成铝粉
（4）铝在空气中极易生成一层致密的氧化膜,保护铝内部不被腐蚀
（5）丙同学

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