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  1. ...the radial muscles of the iris contract and the circular musclesrelax. The pupil becomes larger in size (dilates) and more light is allowed to pass through the lens and...

    分類:科學及數學 > 化學 2007年04月09日

  2. ...between lead and copper in the reactivity series, in order to help pupils to remember that lead and more reactive metals can react.... 3. K atom is larger in size than Na, because K has one more electron...

    分類:科學及數學 > 化學 2007年01月02日