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当前学科：常减压装置考试
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水环式真空泵的应用，提高了抽真空系统的（），降低了（）用量。
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实验设计的基本要素是（）
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（）
体育与健康课程具有基础性、实践性、健身性和（）。
樱桃气调的适宜指标为（）
沥青砂浆是由（）制成，砂的粒径一般不应大于2mm，而且要干净。
Murphy征阳性常见于（）
产褥期抑郁症预后不良，再次妊娠不复发。
美国有关工程造价的定额、指标、费用标准等一般是由（）制定。
收报单位：“中国铁道科学研究院”，收报所略号是（）。
电流方向不随时间而改变的电流是（）。