This paper analyzed the current situation and existing problem of low-temperature water system.

分析低温水系统运行现状及存在的问题。

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The article analyses especially that implements the current situation and existing problem in principle of national treatment of foreign capitals of our country.

文章重点分析我国外资国民待遇原则实施现状和存在的问题。

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This paper describes the background basic principle, features and current situation of digital watermarking, and provides the classification of typical algorithm and analyzes the existing problem.

介绍了数字水印技术背景、基本原理、特点及现状，并给出典型算法的分类和目前存在的问题。

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