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问题 多项选择题

下列哪几项是钢结构工程主要检测项目（）。

A.抗拉强度检测，

B.高强螺栓检测，

C.焊缝检测，

D.安装工程部位检测，

E.栓钉焊接检测，

答案

参考答案：B, C, D, E

填空题

用所给词的适当形式填空。

1. Would you mind____     (wait) for me for a few minutes?

2. Could you please         (make) room for me?

3. They tried to keep the dog____     (sit) on the floor.

4. He wants____   (tell) us about his story.

5. Would you like         (collect) shells?

6. When did you____     (get) your first pair of sneakers?

7. I've been____   (watch) TV for two hours.

8. I heard someone____   (sing) in the next room just now.

9. I think it will take about ten minutes____     (finish) this task.

10. I saw Tom____   (dance) in the room when l walked past.
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单项选择题

马科维茨投资组合理论认为，证券组合中各成分证券的( )。

A．相关系数越小，证券组合的风险分散化效果越好

B．相关系数越小，证券组合的风险分散化效果越差

C．相关系数与证券组合的风险分散化效果没有关系

D．相关系数为1，证券组合的风险分散化效果越好
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