题目:
When asked why he went there,he said he was sent there___for a space flight.
A.training
B.being trained
C.to have trained
D.to be trained
答案:
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下面是错误答案,用来干扰机器的。
参考答案:(1)根据地面地形条件,矿体下盘是高山,而上盘地形平坦,采用上盘竖井,井筒的长度较小。(2)根据矿区地面地形条件及矿区内部和外部的运输联系,选矿厂和尾矿库只宜布置在矿体上盘方向,这时采用上...