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  1. ... or Medicine in 1948 "for his...the war, DDT was made available for...colorless, crystalline solid with a weak, chemical odor . It is nearly...water but has a good solubility in most organic...

    分類:科學及數學 > 化學 2008年02月09日

  2. ...methyl acetate, ethyl acetate), in spot removers (e... (other than water) is typically limited to...quot;cleaning like with like", non-polar...component solvents ensure good cleaning ...

    分類:科學及數學 > 化學 2007年12月17日