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两个独立样本t检验应当选择的操作菜单是（）
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简述堤防洞穴隐患的处理方法。
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精子活动良好是指精子（）。
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安装在油管上的某一部位，用来局部封闭井筒中一定位置上的油、套管环形空间，隔开上下相邻油层，消除在同一井筒内各油层之间相互干扰的工具称为（）。
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设备技术规程覆盖设备前期管理、运行维护管理和（）。
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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! ___7___内应选（）
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水准测量时，转点处应将尺垫踩实，水准尺应立于尺垫（）。
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在Excel中，COUNT（）函数用于计算工作表指定区域的（）。
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患者，女，声音嘶哑多年，每因多讲话后症状加重，查双声带暗红，边缘增厚，闭合不全，并有干咳少痰，颧红，虚烦少寐，腰膝酸软，手足心热，舌红少苔，脉细数。若检查一侧声带有突起，且表面不光滑，有分泌物，首先应考虑的疾病为：（）
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在镗削铸件和精加工时，当镗杆刚性差，而排屑情况尚时，主偏角一般取（）。