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  1. ...about 1931, hoping it would be a suitable replacement for die cast zinc in many applications. Success was...of the diagram, and which ones are angled away . The isomer where all of them are on the...

    分類:科學及數學 > 化學 2008年02月29日

  2. ... to separate from its mother rock, and then gets carried away into a stream or river. The flowing water tumbles the Gold...

    分類:科學及數學 > 化學 2009年11月26日

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