丁荣是北京四中的一名教师。
Ding Rong is a teacher from the Fourth Middle School of Beijing.
分别研究了浓硫酸和钛酸四正丁酯两种催化剂对产率的影响；
The different effect between tetra-n-butyl titanate and sulfuric acid was studied.
分别研究了浓硫酸和钛酸四正丁酯两种催化剂对产率的影响；
The different effect between tetra-n-butyl titanate and sulfuric acid was studied.
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