The Depositing Regulations of and Mining Countermeasures for the Grit Stone Roof of No. 11 Coal Seam in Tongjialiang Coal Mine是什麼意思_The Depositing Regulations of and Mining Countermeasures for the Grit Stone Roof of No. 11 Coal Seam in Tongjialiang Coal Mine在線翻譯_英語_讀音_用法_例句