钢包车下降到下限位，液压缸行程显示（）时，钢包台车走行允许，即可将钢包车开出，顶升操作结束。 _炉外精炼工_全学科试题题库

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题目：单选题
钢包车下降到下限位，液压缸行程显示（）时，钢包台车走行允许，即可将钢包车开出，顶升操作结束。
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