File:Primary coking coal 20180405 154027 1.jpg

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中文(中国大陆):焦煤的样本。
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Source Own work
Author Leiem

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5 April 2018

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current03:09, 7 April 2018Thumbnail for version as of 03:09, 7 April 20183,968 × 2,976 (2.13 MB)LeiemUser created page with UploadWizard

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