4、塔吊修理时，必须让修理人员佩戴安全带，以防发生意外。

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　　项目部生产经理张xx针对于二号宿舍楼一层北段发生下沉的原因，进行了归纳和阐述：

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• Keep it short and easy to remember.
• Use keywords related to your blog's topic.
• Avoid using hyphens or numbers.
• Make sure it's available (you can use a domain registrar's search tool to check).

　　根据二号宿舍楼和办公楼的建筑面积，钢筋工不少于50人，一号宿舍楼钢筋工不少于20人。