A method of feeding nitrogen to replace gas between two scrapers is adopted in Beijing Gas Loop Line originating from Huabei Oil Fields which is the source of gas supply for Beijing City.是什么意思_A method of feeding nitrogen to replace gas between two scrapers is adopted in Beijing Gas Loop Line originating from Huabei Oil Fields which is the source of gas supply for Beijing City.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句