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classification of coal mining roof中文是什么意思
- 煤礦頂板分級(jí)
- classification n. 1.選別；分等，分級(jí)；分選。 2.【動(dòng)、植】分類(lèi)( ...
- coal n. 1.煤，煤塊，煤堆。 2.〔pl.〕〔美國(guó)〕(一堆 ...
- mining n. 1.采礦，采礦業(yè)，礦業(yè)。 2.敷設(shè)地雷[水雷]。 ...
- roof n. 1.屋頂，房屋；家屋。 2.(放行李的)車(chē)頂；笠形 ...
- coal mining 采煤; 煤礦開(kāi)采; 煤炭開(kāi)采業(yè); 原煤開(kāi)采
- classification of coal 煤的分類(lèi)法
- coal classification 煤的分類(lèi)
- roof coal 留頂板煤
- high-roof mining system 高礦房回采
- bituminous coal underground mining 生煤地下開(kāi)采
- changes in a coal mining district 煤鄉(xiāng)的變遷
- coal and mining industry 煤蘇; 煤炭開(kāi)采業(yè)
- coal mining accident 煤礦事故
- coal mining administration 煤礦管理局
- coal mining designing institute 煤礦設(shè)計(jì)院
- coal mining equipment plant 煤礦設(shè)備廠
- coal mining explosive 煤礦用炸藥
- coal mining geology 煤礦地質(zhì)
- coal mining industry company 煤礦工業(yè)公司
- coal mining institute of america 美國(guó)煤礦業(yè)學(xué)會(huì)
- coal mining machine 采煤機(jī)
- coal mining machinery plant 煤礦壞廠; 煤礦機(jī)械廠
- coal mining research institute 煤炭科學(xué)研究院
- coal-mining emulsifying explosive 煤礦乳化炸藥
- coal-mining engineer 采煤工程師
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