常见例句Ammonium persulfate and sulfuric acid were used to turn completely the polyphosphoric acid into orthophosphoric radicals, which were then determined by spectrophotometry.可用过硫酸铵和硫酸将多聚磷酸全部转化成正磷酸根，再用分光光度法测定其质量分数。 返回 polyphosphoric