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【单选题】
在特别潮湿及严重污秽等恶劣环境下，隧道内接触网+25kV带电体距-25kV带电体的静态间隙困难值为（ ）。
A.
400mm
B.
450mmm
C.
500mm
D.
600mm
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【单选题】Lightning and thunder are related events. Lightning is a sudden, violent flash of electricity that occurs between a cloud and the ground or between two clouds in the sky. A lightning bolt can be sever...
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B.
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【单选题】为了把2-戊炔转变为顺-2-戊烯,应采用下列哪一个反应条件?
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