It's suggested that design basic wind speed based upon 50-year mean recurrence interval, and coefficient for importance of a structure taken as 1.
建议声屏障结构设计基本风速重现期取50年，风荷载应考虑活载风与极限风两种情况，重要性系数取1。
The meteorological gradient system has started observing basic elements, including wind speed, direction, temperature and moisture since 1979.
平均场系统从79年开始进行常规气象要素的观测，包括风速、风向、温度和湿度。
The meteorological gradient system has started observing basic elements, including wind speed, direction, temperature and moisture since 1979.
平均场系统从79年开始进行常规气象要素的观测，包括风速、风向、温度和湿度。
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