题目内容：
干式变压器所在环境的相对湿度不超过（）%。A．50
B．50～65
C．70～85
D．85～100
参考答案：
单选：干式变压器所在环境的相对湿度不超过（）%。A．50B．50～65C．70～85D．85～100
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A．50
B．50～65
C．70～85
D．85～100
A．50
B．50～65
C．70～85
D．85～100
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