题目：
采掘工作面接近（）和导水陷落柱时，必须确定探水线进行探水。
A、含水层
B、导水断层
C、溶洞
D、断层
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
采掘工作面接近（）和导水陷落柱时，必须确定探水线进行探水。A、含水层 B、导水断层
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