The paper analyzes the character of nodular cast iron and the speciality of Guangzhou city, discusses the application of nodular cast iron pipes in gas engineering in Guangzhou.是什么意思_The paper analyzes the character of nodular cast iron and the speciality of Guangzhou city, discusses the application of nodular cast iron pipes in gas engineering in Guangzhou.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句