THE APPLICATION OF ULTRASONIC TECHNIQUE TO INSPECTING GROUTING QUALITY IN THE WORKED-OUT AREA OF A COAL MINE是什么意思_THE APPLICATION OF ULTRASONIC TECHNIQUE TO INSPECTING GROUTING QUALITY IN THE WORKED-OUT AREA OF A COAL MINE在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句