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作者在统计资料的基础上,查明了国外最广为应用的延期雷管的使用频率,从安全性的角度试验了各种延期间隔的雷管效果。
Based on the statistical data, the author identifies the most frequently used detonators in foreign countries, and tests the detonator effect of various delaying intervals from a safety point of view.