【单选题】
It was when I read his letter ___ I realized he had given me huge help.
A. that
B. then
C. before
D. after
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If you don’t ___ cooking today, we can go out to eat at the new restaurant.
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___ so many people around, it wasn’t convenient to have a long talk with him.
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加工起爆管和检测电雷管电阻应在离临时存放爆破器材的车辆___m以外的地方进行。
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用人工搬运爆破器材时,一人一次背运原包装炸药不能超过___箱(袋)。
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非法携带爆炸性物品,进入公共场所或者公共交通工具,危及公共安全,情节严重的,处___有期徒刑、拘役或者管制。
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冲击波感度是指在___作用下炸药发生爆炸的难易程度。
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导爆管的管壁材料为高压聚乙烯___。
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在炮孔内放置起爆药包时,雷管脚线要顺直,轻轻拉紧并贴在孔壁一侧,防止损坏___,同时可减少炮棍捣坏脚线的机率。
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