有如下命令序列：GO50SKIP?RECNO()设当前数据库文件有50条记录，执行以上命令序列后输出的结果是()

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()

A、防止液沫夹带
B、保证降液管出口处的密封
C、防止淹塔
D、防止液泛

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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