It ' s a typical unilaterally centralized city , centered by business center , having radialized all - direction - extended ( or round - extended ) residences and industrial estates 它是以商业中心为核心，住宅、工业区呈辐射状向周边扩散的典型的单向集中型城市。
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With the development of science and tecbnology , the electronic warfare has gotten to a new stage , electronic jammers , anti - radialized missiles , superlow altitude attacks have turned into great threats confronted with radar nowadays . former single - based radar not only had difficulty in finishing expected tasks , but also the survival of itself had been a pressing problem , people have to probe into multifarious countermeasures in order to improve the viability and effective work - capacity 随着科技的发展，雷达电子战发展到一个新的阶段，电子干扰、反辐射导弹、低空突防和隐身武器已成为当今雷达面临的四大威胁。传统的有源雷达不仅很难完成预定的任务，而且自身的生存也成了紧迫问题，人们不得不积极探讨各种对策，以提高雷达的生存和有效工作能力。
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