... alternation 交替；转换 alternation gate 或门 alternative attribute 更改属性 ...
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... 交变，交替 alternation 交替闸 alternation gate 交替开关 alternation switch ...
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Before alternation, failures often occurred in the hoist control system of tail water gate in Ankang Hydropower Station, which had impact the normal electricity generation.
安康电站尾水门机电气控制系统在改造前故障时有发生，严重影响电站正常生产，甚至威胁到电站防汛工作的开展。
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