The acoustic character controlled by the active noise attenuation system in ducts has been analyzed in detail on premise of semi-infinite ducts.
在假设半无限长管道的前提下，详细分析了噪声有源控制系统作用下的管道声场特性。
Under this premise, prototype system of process planning facing virtual assembly is tapped, and the demands of function, performance, information of the system are analyzed in detail.
以此为前提，开发了面向虚拟装配的工艺规划原型系统，对系统的功能需求、性能需求和信息需求进行了详细分析。
Under this premise, prototype system of process planning facing virtual assembly is tapped, and the demands of function, performance, information of the system are analyzed in detail.
以此为前提，开发了面向虚拟装配的工艺规划原型系统，对系统的功能需求、性能需求和信息需求进行了详细分析。
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