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题目：
未知类型
A.降低船的重心以提高稳性
B.调整船的浮态
C.增大船的重量以加大吃水
D.降低船的载重量
答案：
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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! ___8___内应选（）
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如果企业只生产一种产品，全部生产成本都是直接成本，可直接计入该产品生产成本明细账的有关成本项目中，不存在在各种成本核算对象之间分配成本的问题。
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在无线市话网的系统结构中，不属于业务控制层的是（）。
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采取各种办法，提高在用加热炉、锅炉的热效率可以（）.
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可引起低钠、低氯、水中毒（）
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统计资料中的定类尺度的特点是（）。
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灰石粒度增大，会造成窑温升高。
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测速发电机是一种把()信号转换成电压信号的测量元件。
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自动空气断路器的灭弧栅片是用（）制成的。
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煤粉的R90值越大，则说明煤粉越细。()