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【单选题】
我国根据发生触电危险的环境条件将安全电压分为三种类别，高度危险（如潮湿、有导电粉末、炎热高温、金属品较多）的建筑物中，其界限值为（）。A.
20V
B.
25V
C.
35V
D.
36V
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