Article 53 The quality of coal supplied to customers by coal mining and coal trading enterprises shall meet the national or trade standards. The quality of a specific type of coal shall match its grade and price.

• 第五十三条 煤矿企业和煤炭经营企业供应用户的煤炭质量应当符合国家标准或者行业标准，质级相符，质价相符。