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](/uploads/image/z/3628843-43-3.jpg?t=%E5%85%B3%E4%BA%8E%E4%B8%80%E4%B8%AA%E5%8C%96%E5%AD%A6%E5%88%86%E6%9E%90%E7%9A%84The+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
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