yi tu ...na ge al jia fei jing shu bu shi lv he jing ba?er tu...na ge bu ying gai yong x ma?

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yitu...nagealjiafeijingshubushilvhejingba?ertu...nagebuyinggaiyongxma?yitu...nagealjiafeijingshubush

yi tu ...na ge al jia fei jing shu bu shi lv he jing ba?er tu...na ge bu ying gai yong x ma?


yi tu ...na ge al jia fei jing shu bu shi lv he jing ba?
er tu...na ge bu ying gai yong x ma?

yi tu ...na ge al jia fei jing shu bu shi lv he jing ba?er tu...na ge bu ying gai yong x ma?
铝可以和硅(非金属)形成合金
表示价电子既可用点,也可用叉,随意.有多个原子键合时一个用点,一个用叉以示区分.

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