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定时散布标称延时时间相同的雷管实际起爆时间的波动。若采用火焰延时器，则其散布随标称延时时间延长而增加。因此，半秒延时雷管不推荐用于高精度控制光面爆破。为此建议使用电子延时雷管
expl. scatter in timing

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