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【单选题】
钢铁在中性条件下发生电化学腐蚀时，正极的电极反应式为A.
2H 2 O+O 2 +4e - =4OH -
B.
2H + +2e - =H 2 ↑
C.
Fe-2e - =Fe 2+v
D.
Fe-3e - =Fe 3+
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举一反三
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A.
2314
B.
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D.
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【单选题】同一个区段内,可用4种不同速度表示:1.走行速度、2.旅行速度、3.技术速度、4.旅客列车设计行车速度,速度值由大到小的排列顺序是______。
A.
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B.
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