Occurring sequentially from top to bottom, within each iteration, r, d, c, and t represent some of the standard disciplines executed in each iteration (Requirements, Design, Code, and Test).
在每个迭代中从上到下顺序发生的R、D、c和t表示在每次迭代中执行的一些标准规程(需求、设计、代码和测试)。
The roles down the side are Requirements (R), Design (D), Code (C), and Test (T).
在一边的任务是需求（Requirements，R）、设计（Design，D）、编码（Code，C）和测试（Test，T）。
Shenzhen Feng Wood Energy Ltd is a focus on the communications power accessories Products R & D, design, production, sales and service in one of the high-tech enterprises.
深圳烽木能源有限公司是一家专注于通讯产品电源配件研发、设计、生产、销售及服务于一体的高科技企业。
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