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So that, must carry out the study on technology of clean coal.
因此，必须大力开展洁净煤技术研究。
youdao
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Objective To study the clean production technology of diosgenin.
目的研究黄姜皂素清洁生产工艺。
youdao
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Objective To study the clean production technology of diosgenin.
目的研究黄姜皂素清洁生产工艺。
youdao