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How about Hongjian Education?
The correct answer is: option a.

Answer analysis:

This topic examines the safety technical requirements for aerial work. When working in a place where falling is possible, the safety belt must be hung on a solid structure. The safety belt should be hung high and used low, and it is not allowed to be wrapped around the waist at will. The length of the safety belt should not exceed 3m. Therefore, the correct option for this question is "A. Hang high and use low".