【单选题】
中心站主机应不少于___台，1台备用。
A. 1#
B. 2#
C. 3#
D. 4
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答案
B
解析
暂无解析
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以下哪种图纸不是《煤矿安全规程》规定煤矿必须填绘反映实际情况的图纸。___
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