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根据作者及其他爆破工作者的经验浅析了延长药包的适用条件及应用方法，并给出了当前比较实用、合理的延长药包计算公式。
According to the experience of the author and other blasting workers, the applicable conditions and application methods of extending the kits are analyzed, and the formula for extending the kits is given more practical and reasonable at present.