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【简答题】
读下面的一篇短文,然后根据短文内容,将问题的最佳答案填写在题目前的括号里。 One day we invited some friends to dinner. When it was about six o'clock, my wife found that we had little bread. So she asked our five-year-old daughter, Kathy, to buy some. 'Here's a dollar,' my wife said,' get two loaves (条) of bread, if they have it. If they don't have it, get anything. But hurry!' Kathy hurried off, and we waited and waited. By a quarter past six, all the friends had arrived. But Kathy had not returned. Finally we saw her dancing around the corner with a bright new hula hoop (呼啦圈) whirling (旋转) round her middle. 'Kathy!' Her mother cried. 'Where did you get that hula hoop, and where is the bread?' 'Well, when I got to the shop, they had sold all their bread,' answered Kathy. 'And you said 'If they don't have that, get anything!'' 1. One day Kathy's parents invited some friends to ______. [     ] A. has breakfast B. have lunch C. has supper D. have a party 2. How much did Kathy's mother give her? [     ] A. a dollar B. two dollars C. five dollars D. six dollars 3. Kathy ______ in a hurry. [     ] A. played games B. went to the shop C. went to dance D. came back home 4. What did Kathy buy at last? [     ] A. other food B. nothing C. hula hoop D. two loaves of bread 5. Why did she do this? [     ] A. because the shop had sold all their bread. B. because her mother asked her to get anything if they hadn't had bread. C. because she loved playing with hula hoop. D. all above.
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【多选题】回归变差(或回归平方和)是指( )
A.
被解释变量的实际值与平均值的离差平方和
B.
被解释变量的回归值与平均值的离差平方和
C.
被解释变量的总变差与剩余变差之差
D.
解释变量变动所引起的被解释变量的变差
E.
随机因素影响所引起的被解释变量的变差
【单选题】C6150车床( )的正反转控制线路具有接触器互锁功能。
A.
冷却液电动机
B.
主轴电动机
C.
快速移动电动机
D.
润滑油泵电动机
【判断题】C6150车床快速移动电动机的正反转控制线路具有接触器互锁功能。
A.
正确
B.
错误
【单选题】在下面关于数据库的说法中,错误的是 。
A.
数据库有较高的安全性
B.
数据库有较高的数据独立性
C.
数据库中的数据可被不同的用户共享
D.
数据库没有数据冗余
【单选题】C6150车床()的正反转控制线路具有接触器的互锁功能。
A.
冷却液电动机
B.
主轴电动机
C.
快速移动电动机
D.
润滑油泵电动机
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A.
适用于护理人员相对稳定的科室
B.
护理人员班次轮转较频繁
C.
较好地满足了护理人员的个人需求
D.
排班模式相对固定
【单选题】在下面关于数据库的说法中,错误的是( )
A.
数据库有较高的安全性
B.
数据库有较高的数据独立性
C.
数据库中的数据可以被不同的用户共享
D.
数据库中没有数据冗余
【单选题】经产妇第二产程一般不得超过( )
A.
10 分钟
B.
15 分钟
C.
30 分钟
D.
60 分钟
E.
90 分钟
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A.
护理人员班次轮转频繁
B.
适用于护理人员相对稳定
C.
较好地满足了护理人员的个人需求
D.
排班模式相对固定
【判断题】C6150型车床快速移动电动机的正反转控制线路具有接触器互锁功能
A.
正确
B.
错误
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