问题
单项选择题
井道应设置永久性的电气照明装置，即使在所有的门关闭时，在轿顶面以上和底坑地面以上1m处的照度均至少为（）lx。
A、30
B、50
C、80
D、100
答案
参考答案：B
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井道应设置永久性的电气照明装置，即使在所有的门关闭时，在轿顶面以上和底坑地面以上1m处的照度均至少为（）lx。
A、30
B、50
C、80
D、100
参考答案：B
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