[网络] 多磷酸

polyphosphoric的用法和样例：

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。

每天三分钟学英语第255期:你会念hydrofluoric这个词吗?如何用"拼读法"记单词?

情景对话： Walter: Not hydrofluoric. 氢氟酸就不会。 Jesse: Why not? 为什么不会？知识点笔记： hydrofluoric 氢氟酸 1. 确定辅音相对来说，辅音变化最少。单词中 h，dr，fl，r 和 c，都没有特殊和奇怪

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英语笑话（MP3+文本）

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Sorry,there is not text temporarily, Please help tingroom to look for it! 如果您能找到更好的听力原文，请发贴到听力原文收集区，您将会获得10到30积分的奖励! Thank you！

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Tea has complex compounds called polyphenols which are believed to help the arteries to relax or dilate, thus enabling a smoother flow of blood. 茶中含有一种叫多酚的复杂混合物。这种物质据信能帮助放松或扩张动脉，从而使

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Every time i go to the grocery stores，i consider buying Organic vegetables because they are supposed to be healthier or something，but they are also moreexpensive. So is it worth it to pay more for the supposed health benefits? Well, it might be w

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英语时差8，16

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学英语单词

abrasion shore

acute asthmatic attack in children