[交流] 求助反应一句话，化学方面。

Originally posted by cailianguo at 2011-01-10 12:56:25:

全文是：Molecular weights 106,156,206,256,306,and 406(which are aromatic one-ring through seven-ring compounds with two methyl substituents) are considered as representative of typical monoer mol ...

Originally posted by liufawen at 2011-01-09 21:58:30:
是单环芳香烃通过2个甲基取代的七环化合物

Originally posted by cailianguo at 2011-01-10 07:57:29:

单环芳烃取代2个甲基后怎么会成为7环化合物呢？