Coal lump in scientist hand and small heap in other. Fossil fuel energy research concept.
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- 大图:7360 × 4912 像素·62.31 cm × 41.59 cm·300dpi·JPG
- 中图:1000 × 667 像素·35.28 cm × 23.53 cm·72dpi·JPG
- 小图:500 × 334 像素·17.64 cm × 11.78 cm·72dpi·JPG