The mix of humic acid with diffusion agent N have good effect too.
当采用扩散剂N时，与腐殖酸混合使用效果也较好。
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.
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；
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