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根据目前的开采技术水平,一般大型矿井井田的走向长度不少于:【 】

单选题
2021-09-01 20:19
A、1500m
B、4000m
C、5000m
D、7000m
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正确答案
D

试题解析

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根据目前开采技术水平,中型矿井井田走向长度:【 】
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