graded coal 中文意思是什麼
graded coal
解釋
分級的煤-
Article 30 coal mining enterprises shall exercise strict supervision, inspection and control of coal product quality. such quality shall be graded according to the national or trade standards
第三十條煤礦企業應當加強煤炭產品質量的監督檢查和管理。煤炭產品質量應當按照國家標準或者行業標準分等論級。
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