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现在工业用火工品市场年销售额约为300亿日元,其中炸药占65～70％,雷管类占20％左右。为了解炸药和雷管品种的变异,首先有必要知道近来火工品需求结构的
Annual sales of industrial products now about 30 billion yen, of which explosives accounted for 65 to 70%, detonators accounted for about 20%. In order to understand the variation of explosives and detonators, it is first necessary to know the structure of the demand for the explosive