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摘要: SAFETY ISN'T MAGIC. It isn't rocket science either. It's a culture. It's a commitment. An ever-present awareness. Ask any fabricator where they rank safety, and no doubt most of them will tell you it's their number-one priority. And they'll mean it. But it's those shops...
The utility model provides a teaching building staircase, which comprises staircase steps, staircase railings and a central processing unit. Pressure sensors are arranged on the upper end faces of the staircase steps, and a speaker and a bulb connected with the central processing unit are disposed...