reagent grade water是什么水呢?蒸馏水还是双蒸水?

reagent grade water是什么水呢?蒸馏水还是双蒸水? 什么叫试剂级我们做比对试验的时候所选择的reagent-grade的物质是标准品是么?也就是试剂级?请专家指点,不胜感激! unclogging reagent是什么意思Did you have any luck?整句话是in regards to the unclogging reagent,did you have any luck? Grade意思是 tissue culture grade water 什么意识啊 什么水 Amplex Red Reagent是什么, chemical reagent是什么意思 reagent什么意思啊 reagent A 是什么 Mukaiyama Reagent 是什么试剂 grade Grade 英语翻译EXPERIMENTALReagentsODOPB was prepared in our laboratory.26 Epichlorohydrin (EPI) from Janssen Co.and potassium hydroxide from Showa Co.were used as received.All solvents were reagent grade or were purified by standard methods before use. 英语翻译原文：Chemicals.Organic Acids.Lactic (Fisher,certified,86.6%),acetic (Fisher,reagent grade,99.7%),propionic (Fisher,certified,99.9% ),and butyric acids (Fisher,certified,99.9%) were used as received to prepare the organic acid solution grade是可数名词吗 food grade rollers在化学里是指什么grade rollers在橡胶行业中指的是什么?还有rics rollers 以及 printing rollers 各指什么、》.》、?还有一些不知道的是 rice polisher和 hot water bottles 以及 I.B caps 都指的是 Grade是指学分还是指成绩? Grade Pre-K-K 是啥意思