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本文介绍了一种用不低于孔内段别的雷管作为孔外微差的网路，并结合工程实践阐述该网路对减小爆破振动的作用．
In this paper, we introduce a kind of grid with no less than the inner part of the hole as the difference between the outer and outer holes, and explain the function of the network to reduce the blasting vibration with engineering practice.