AGA documents include standards on Gas Displacement Meters, as well as the National Fuel Gas Code, National Fuel Gas Code Handbook, and the Guide for Gas Transmission and Distribution Piping Systems.是什么意思_AGA documents include standards on Gas Displacement Meters, as well as the National Fuel Gas Code, National Fuel Gas Code Handbook, and the Guide for Gas Transmission and Distribution Piping Systems.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句