Developing service standards, phased requirements and improvement plans.
制定服务标准，阶段性要求及提供改善方案；
Proposals are made for improvement on the design of a new type of intersection, i. e. the multi-phased channelized intersection.
多相位渠化路口是一种新型的城市道路平面交叉路口，本文对这种路口的设计提出某些改进和建议。
PWA-1 automatic ultrasonic phased array testing system developed in our country was introduced, and the future improvement of the system was also described.
对国内率先开发的PWA - 1型全自动相控阵超声检测系统进行了详细介绍，并对该系统的进一步开发进行了展望。
PWA-1 automatic ultrasonic phased array testing system developed in our country was introduced, and the future improvement of the system was also described.
对国内率先开发的PWA - 1型全自动相控阵超声检测系统进行了详细介绍，并对该系统的进一步开发进行了展望。
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