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当前学科：物流技术与装备I
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4.关于三类机车的说法正确的有（ ）
A. 蒸汽机车的运行速度最小
B. 蒸汽机车的构造造价复杂较高
C. 电力机车的热能效率最高
D. 内燃机车的维护十分困难
E. 内燃机车的马力比较大
F. 电力机车没有空气污染
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