This net is the first whole-area covered GPS survey control net(Class C)built for rivers in China, and a successful example of application of GPS in waterway management in China.是什么意思_This net is the first whole-area covered GPS survey control net(Class C)built for rivers in China, and a successful example of application of GPS in waterway management in China.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句