Professional engineers are teaching workers to work. team work concept Wear safety clothing with a helmet in the factory. industrial concept
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- 大图:5616 × 3744 像素·47.55 cm × 31.7 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