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【单选题】
用水或一般灭火器浇灭距离接触网带电部分不足( )米的着火物体时,接触网必须停电;若使用沙土灭火时,距接触网在( )米以上者,可不停电。A.
4 ， 2
B.
2 ， 4
C.
5 ， 3
D.
3 ， 5
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A.
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B.
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C.
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D.
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E.
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A.
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B.
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