关于一个化学分析的The enclosure may be sealed and the mixing fanoperated for a period of up to 12 hours before the initial HC concentrationreading and the initialmethanol concentration reading is taken and the four-hour backgroundmeasurement

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关于一个化学分析的The enclosure may be sealed and the mixing fanoperated for a period of up to 12 hours before the initial HC concentrationreading and the initialmethanol concentration reading is taken and the four-hour backgroundmeasurement
关于一个化学分析的
The enclosure may be sealed and the mixing fanoperated for a period of up to 12 hours before the initial HC concentrationreading and the initialmethanol concentration reading is taken and the four-hour backgroundmeasurement period begins
有几个词连起来了，这里是修改过的
The enclosure may be sealed and the mixing fan operated for a period of up to 12 hours before the initial HC concentration reading and the initial methanol concentration reading is taken and the four-hour background measurement period begins.
enclosure 实验间 HC碳氢 methanol 甲醇，上下文我也没法连接，

关于一个化学分析的The enclosure may be sealed and the mixing fanoperated for a period of up to 12 hours before the initial HC concentrationreading and the initialmethanol concentration reading is taken and the four-hour backgroundmeasurement
外壳可密封和混合fanoperated一段长达12小时前的初始HC concentrationreading和initialmethanol浓度读数和四小时backgroundmeasurement期开始

密闭搅拌12小时，得到初始HC浓度及初始甲醇浓度，然后开始4小时的背景测量周期。。。。。。。。不知道对不对，具体还得联系上下文。你的原文中可能少了几个空格

如何评价一个化学分析方法的准确度关于一个化学分析的The enclosure may be sealed and the mixing fanoperated for a period of up to 12 hours before the initial HC concentrationreading and the initialmethanol concentration reading is taken and the four-hour backgroundmeasurement 化学分析工岗位责任化学分析工的具体岗位责任是什么? 化学分析与分析化学的区别分析化学与化学分析的区别? 常规的化学分析包括哪些方面请教氢氧化铝的化学分析方法关于化学分析的消解反应和溶解区别,请简述下, 用初中化学分析固体氢氧化钠的作用化学高级化学分析工是做什么工作的? 冰的组合及化学分析式电位滴定法与化学分析法的区别化学分析中半滴试剂的滴加化学分析纯配制标准溶液的公式学化学分析的该怎么定位人生化学分析室的布置有哪些要求我在做一个化学分析QC课题,题目是“提高头孢孟多酯钠的分离度”不知如何写,请指教, 化学分析工证书各省颁发的化学分析工中级证书是属于国家的证书吗?