题目内容

在建工程(包括脚手架)的外侧边缘与外电架空线路的边缘之间，必须保持安全距离。当外电线电压为10kv时，应不小于()m

A. 2
B. 4
C. 6
D. 8

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为预防碘缺乏，常在缺碘地区用碘化物强化食盐，碘加入量一般控制在()。

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