以往徐崇嗣提出的自封线以降液管几乎不漏气作为自封点。
The previous seal line proposed by Xu is too conservative, in which the criterion of almost not allowing the vapor to leak through the downcomer was set.
徐崇温：《存在主义哲学》。北京：中国社会科学出版社，1986年。
Xu Chongwen. Philosophy of Existentialism. Beijing: China Social Science Press, 1986.
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