本文在一个较弱的条件下证明了关于最大公因子矩陈与因子封闭集的关系的一个猜想。
This paper gives a proof of a conjecture on the relation between the greatest common divisor matrix and the factor closed set under a certain condition.
汉字是表义文字，具有丰富的语义内容，汉字是一个有限的封闭集，它的数目是有限的，而汉语的词是一个开放系统，它是无限的。
As an ideography of abundant semantic contents, the Chinese character is a closed set with limited number while the Chinese word is an open system which is unlimited.
本产品是集封闭微孔结构与网状纤维结构为一体的优质高效保温材料。
This product is a closed pore structure and the reticular fiber network structure for the integration of high quality thermal insulation material.
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