This paper expounds the surveying principles of GPS (PPK),and probes into the application of GPS (PPK) surveying and positioning in the mine surveying.是什么意思_This paper expounds the surveying principles of GPS (PPK),and probes into the application of GPS (PPK) surveying and positioning in the mine surveying.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句