Suitable for all metal duct systems operating in air stream velocities up to 25.4m/sec and temperatures up to 121 degrees C.是什么意思_Suitable for all metal duct systems operating in air stream velocities up to 25.4m/sec and temperatures up to 121 degrees C.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句