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糖尿病的预防通常分为三级，分别是（）
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男性，28岁。1周前搬重物后感腰痛，伴左下肢放射痛，咳嗽、喷嚏时症状加重，不能下床活动。既往无类似发作史。查体：腰椎生理弧度消失，活动明显受限，直腿抬高仅达30°，加强阳性。左足外侧皮肤感觉减退，左跟腱反射减弱。X线平片：腰椎生理弧度消失。尿常规正常。诊断首先考虑（）。
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（）应当对原始凭证内容的真实性、合法性负责。
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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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下面被称为悲观的决策方法是（）。
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利用矿石中各矿物磁性强弱的不同，在外界磁场中进行选别分离的选矿方法是（）。
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关于131I-美罗华显像，下列说法错误的是（）
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民族的分类，以（）和（）为基本依据。
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商品在一定的环境条件下相互结成一个巨大分子的现象称为（）。
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电气运行工作的主要任务是什么？