Strategic level This part studies mainly on the construction pattern of returned logistics.

战略层主要研究回收物流的构建模式。

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Based on the construction pattern and the control principle of stepmotor, fractional step Angle control of stepmotor is achieved by PWM Phase Vector Cornposition.

本文根据步进电视的结构与控制原理，提出一种PWM式相矢量合成分数步距角控制方案。

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The whole essay is divided into three chapters:The first chapter summarizes the present conditions, the prospect, the construction pattern and also the social significance of the flat construction.

全文分为三章：第一章概括介绍了我国高校学生公寓建设的现状、发展前景、建设模式以及社会意义等；

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The revisions offset each other, continuing the recent pattern in which the slowdown in housing is being offset by the pickup in nonresidential construction.

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