The operational layer controls also variable speed signs, lane closing symbols and variable message signs.
业务层还控制着可变速度标识，车道结束标志和许多可变信息标志。
The traditional 3-layer feed forward BP network modal of morphological opening and closing operation was modified by extending the input layer data.
采用扩展输入层数据的办法修正了传统的形态开、闭运算三层前馈BP网络模型。
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