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Created by UL
Category Safety > Substances and Hazard Communication
认识密闭空间
识别雇主与密闭空间相关的责任
解释密闭空间授权进入人员、值守人员及进入管理人员的职责
识别与密闭空间相关的危害
辨别易燃、有毒、刺激性或腐蚀性及窒息性气体的区别
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