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如果某企业的信用条件是“2/10,N/30”,则放弃该现金折扣的机会成本为()。
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掘进工作面要安设()等防尘措施,并坚持使用湿式钻眼和水炮泥。
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尿石症不可能出现的症状是()。
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()作絮凝剂使用
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蒸发是液体表面发生气化的现象,下列哪些方法可以加速蒸发()。
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“邮资票品管理系统”对内来说是一个包含了实物的规划设计、生产、()并结算的过程。
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()是在密罐技术上逐步发展起来的一个新的概念,在其中可以部署一个或者多个密罐,来构成一个黑客诱捕网络体系架构。
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在船舶照明系统中,()表现是照明线路的绝缘值电阻小于0.5MΩ或等于零,其原因一般是由于电缆线老化破损碰地或灯头接线处线路碰壳引起的,特别是甲板照明线,经常受到海水和盐雾的侵蚀,更容易发生。
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石灰“陈伏”的目的,是消除()的有害作用。
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As Christmas is coming, there are presents to be bought, cards to be sent, and rooms to be cleaned. Parents are ___1___ with difficult jobs of hiding presents from curious young children. If the gifts are large, this is sometimes a real ___2___. On Christmas Eve, young children find the excitement almost unbearable. They are torn between the wish to go to bed early so that Father Christmas will bring their presents quickly and the wish to stay up late so that they will not miss the fun. The wish for gifts usually proves stronger. But though children go to bed early, they often lie awake for a long time, hoping to get a short ___3___ at Father Christmas. Last Christmas, my wife and I successfully hid a few large presents in the storeroom. I ___4___ the moment when my son, Jimmy, would ask me where that new bike had come from, but ___5___ he did not see it. On Christmas Eve, it took the children hours to go to sleep. It must have been nearly ___6___ when my wife and I went quietly into their room and began filling stockings. Then I pushed in the ___7___ I bought for Jimmy and left it beside the Christmas tree. We knew we would not get much sleep that night, for the children were ___8___ to get up early. At about five o’clock the next morning, we were woken by loud sounds coming from the children’s room — they were shouting excitedly! Before I had time to get out of bed, young Jimmy came riding into the room on his new bike, and his sister, Mary, followed close behind pushing her new baby carriage. Even the baby arrived. He moved ___9___ the hands and knees into the room dragging a large balloon behind him. Suddenly it burst. That woke us up ___10___. The day had really begun with a band! ___3___内应选()