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与2011年相比，2012年全国规模以上工业企业主营业务收入：
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钴-60治疗机为预防特殊情况发生，应急开关以下安装哪项不合理？（）
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试写出牙型为三角形、梯形、锯齿形螺纹的受力特征与用途？
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简述铝铸件气孔形成的主要因素。
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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（）
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绩效的目标管理法考评方法的主要缺点是（ ）
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我国分布的HBsAg亚型主要是（ ）
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创伤或感染时，有关机体的代谢变化错误的是（）。
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下列适宜大型浮顶油罐和大型变压器灭火的灭火器类型是（）。
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液压启闭机因液压缸的内部泄漏而引起闸门的沉降量在（）小时内应不大于100mm。