coal-ball

英 ['kəʊlb'ɔːl] 美 ['kəʊlb'ɔːl]

释义
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- 煤结核, 煤层石球
临近单词

coalless coal coal processing and conversion coal mining and gas extraction coal preparation technological coal matrix flexibility energy coal-based activated carbons coal or rock dynamic disasters coal and gas pressure outburst coal transportation technology coal-fired hot-blast stove coal hydroliquefaction residue

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