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压风机应有压力保护、温度保护、断水保护、断油保护。（）
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苯丙酮尿症患儿血苯丙氨酸浓度宜维持在（）
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甲状腺静态显像下列哪项不正确（）。
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什么是回转式空气预热器的“蘑菇状”变形?它是怎么形成的?
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如何培养专业技术人员的学习能力？
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具有两个细胞核的细胞一定是肿瘤细胞
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按广东农信社社保卡业务的规定，办理社保卡激活业务，需补充客户信息包括（）
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在一对一入户教学前，时间安排上要（）
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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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有效工时利用率=(制度工时-停工与损失工时-非工作工时-休息及生理需要工时)/制度工时×100%。()