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This article introduced one kind of brand-new involvement type microcomputer relay protection test installation and its realization principle, main function, the characteristic and application method.
介绍了一种全新的介入式微机继电保护的实现原理、主要功能、特点和使用方法。
The raw materials and installation are introduced. The specifications and technological process are stated. The structures of molds used in one-step processing method are discussed.
介绍了铝-塑复合管材的原材料准备及成型加工过程。对一次成型法所使用模具的结构作了详细介绍。
Major hazard installation is one important factor influencing on urban safety level. Meanwhile safety planning for major hazard installation is one of effective method to improve urban safety level.
城市重大危险源是影响城市安全水平的一个重要因素，对城市重大危险源的规划和整治是提高城市安全水平的一个重要途径。
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