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简述了扒砂过程中沙爆产生的原因,说明了扒砂前的准备工作,并且提出了在扒砂过程中应注意的事项。
The causes of sand burst in the process of sand-picking are briefly described, the preparation before the sand-holding is described, and the matters needing attention in the process of sand-holding are put forward.