合成的产品三碱式硫酸铅质量符合原化工部行业标准（HG2340—1992）。
The quality of the tribasic lead sulfate synthesized can meet the enterprise standard(HG2340-1992).
目的：了解术前局部注射高三尖杉酯碱联合地塞米松对减少翼状胬肉术后复发的效果。
Objective: to study the effect of homoharringtonine and dexamethasone injection of topical pterygium before excision on the prevention of recurrence of pterygium.
结果表明，三种磺丙基甜菜碱的表面活性随着烷基链长的增加逐渐增强；
The results showed that with the increase of alkyl chain length surface properties activity of three kinds of sulfo-propane betaines was gradually improved.
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