题目内容
空场法在回采过程中，它是把矿块划分为矿房和矿柱两部分来开采，先采矿柱，后采矿房。
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适用于开采矿石和围岩都很稳固的矿床
在留矿采矿法中，局部放矿时严禁任何人员在放矿漏斗上部的留矿堆上作业
下列属于空采采矿法的有（）
Please, John, forgive me, for all the hurt that I _______1___you. It's just to makee you look good even though you've_____2____like...3. If I hadn't come back, you________3___ be standing there and...4. You were the best and the _____4__man that I have ever known.
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