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露天矿床开拓是指建立地面与露天矿场内各水平以及各工作水平之间的矿岩运输通道，以保证露天矿场的生产运输，及时准备出新的工作水平。()A.
正确
B.
错误
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【单选题】It seldom snows here, but it ___ two feet deep yesterday.
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