在塔和塔段最底一层塔盘的降液管末端设置液封盘，其目的是()

Part B (10 points)You are going to read a list of headings and a text about selling your own product via the net Choose the most suitable heading from the list for each numbered paragraph; The first and last paragraphs of the text are not numbered. There is one extra heading which you do not need to use. 点击查看答案

对于循环操作的平推流反应器，当循环比趋近于0时为()反应器

A、全混流
B、平推流
C、全混流或平推流
D、全混流串平推流

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