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1 楼EHS网友 2012-09-24 14:57
应该考虑到1:4原则
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2 楼mycarmaybach 2012-09-25 11:04
the detail description for the lift
thanks for the editor
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3 楼EHS网友 2012-09-25 13:12
Good instruction for safety using ladder, and one more thing:
The ladder's upper lever should be leaned above 1 meter.
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