The paper is about the necessity of setting up a new system of service in the library under the new social circumstance and the influence of its contents on the library.
论述了图书馆在新的社会环境下，建立新的服务体系的必要及新服务体系的内容和它对图书馆的影响。
Establishing this measure is the need of investigating drugs crimes which is unprecedented in the investigation history of our country. It has its necessity and legality under then background.
这一措施的确立是面对毒品的泛滥和侦查毒品犯罪的需要，在我国侦查史上史无前例，这一侦查措施的出台在当时的背景下，有其必要性和合法性。
The necessity of conveyor concentrate control is introduced. The site bus is used as the main net of conveyor concentrate control under the mine. The development prospects are related.
介绍了胶带机集中控制的必要性，描述了采用现场总线作为井下胶带机集中控制的主干网络的技术实践，叙述了其发展前景。
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