education science and technology concept - chemistry teacher showing tablet pc computer to kids or students at school laboratory
ID: 1113445646
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- 大图:5760 × 3522 像素·48.77 cm × 29.82 cm·300dpi·JPG
- 中图:1000 × 611 像素·35.28 cm × 21.55 cm·72dpi·JPG
- 小图:500 × 306 像素·17.64 cm × 10.8 cm·72dpi·JPG