卤素

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(()()()())

()()(xiù )(diǎn )、At()(zhǒng )(yuán )()(de )(huà )(xué )(xìng )(zhì )(hěn )(xiàng )()()(chéng )()()(jiào )(zuò )()()(néng )(zhí )(jiē )()(jīn )(shǔ )(huà )()(chéng )(yán )(lèi )(shì )(zuì )(qiáng )(de )(yǎng )(huà )()(zhī )()()(shì )(zhòng )(yào )(de )(huà )(xué )(yuán )(liào )()()(yòng )(lái )(zhì )(yào )()(rǎn )(liào )()(liào )()(chéng )(xiàng )(jiāo )(děng )()(jiào )()(huò )()()

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