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【单选题】
解除备用，自接到调度命令，短期备用的电力机车在( )内达到出段状态。A.
2h
B.
6h
C.
12h
D.
20h
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A.
people like the shape of a triangle
B.
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C.
the number 3 has a mystical and comforting significance for Western minds
D.
people have three meals a day.
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