... 煤气 coal gas 分粒煤 coal graded 输煤设备，输煤装置 coal handling equipment ...
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graded coal 筛过煤
graded d coal 过筛煤
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.
第三十条煤矿企业应当加强煤炭产品质量的监督检查和管理。煤炭产品质量应当按照国家标准或者行业标准分等论级。
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