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问题 单项选择题

季节因素（）。

A．无法预测

B．是定期重复出现的趋势

C．在趋势线之上或之下的长期观测值

D．反映了时间序列的变化

答案

参考答案：B

解析：

 季节因素是时间序列模型的组成部分，它显示了一年左右的变化。季节因素属于定期的重复趋势。周期因素也是时间序列模型的组成部分，它显示了一年以上的时间序列中源 于周期性的高于趋势以及低于趋势的变化。

填空题

单词拼写 。

1. I came with the i_____(意图)of staying but now I've decided to leave. 

2. She has f_____ you for what you have done wrong to her parents and is trying to help you.

3. The things he said hurt me too, but he has not ______(道歉)to me.

4. This movie may upset a ________ (敏感的) child.

5. She felt g_______ about leaving her sick child alone and going to work.

6. It is i______ to drive through a red light.

7. Did you m_______ the windows before buying the curtains?

8. Prices have risen steadily during the past d ______(十年).

9. Should we take the boy away from the bad _______ (环境的)influences in which he lives?

10. This summary is b______(简短的)and to the point. It is easy for me to understand it.

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单项选择题

圆曲线测设时，当圆弧半径较小，施工场地较平整，没有障碍物时，易用（）测设。

A.钢尺直接丈量法

B.直角坐标法

C.极坐标法

D.距离交会法
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