万向传动装置的组成和作用。

根据句子意思，用括号中所给汉语提示或英语单词的适当形式填空。(每空一词)

1. Zhang Ziyi is one of my favourite _______(act).

2. I hope you think that my advice is worth _______ (take).

3. Would you mind _____      (解释)this problem to me ?

4. The teacher gave me many good ____  _(建议)on my English study.

5. I feel sad when I think of my cat's              .(死)

6. We are very thankful to the ________(目击者) who have given us lots of useful clues.

7. He has s_______ story - books, you can borrow one from him.

8. B_______ is a lake, why not go swimming in it?

9. A_______, you ought to finish it this week.

10. I am a teacher in high school. Teaching is my c_______.

11. Some computer games have a bad              ( affect ) on people, especially teenagers.

12. There are only 2 days left, we had better talk             ( little ) and do more.

13. Our English teacher treats everyone equally. He is a f               person.

14. There are several ways to solve this problem. Let's have a               (讨论)now.

15. His fans rushed towards him              (short) after the match.

男，40岁，10小时前搬重物时突发上胸部疼痛，呈撕裂样，并逐渐向下胸部和腹部延伸。高血压病史15年。查体：T36.3℃，BP170／100mmHg（左上肢），BP140／75mmHg（右上肢）。心率105次／分，心律齐。腹平软，Murphy征阴性。CK-MB正常。心电图：正常。胸部X线片显示主动脉明显增宽。该患者胸痛最可能的病因是（）。

A.急性心肌梗死

B.变异型心绞痛

C.主动脉夹层

D.急性胆囊炎

E.急性心包炎

当复杂电路的支路数较多、结点数较少时，应用结点电压法可以适当减少方程式数目。这种解题方法中，是以客观存在的结点电压为未知量，直接应用（）定律和欧姆定律求解电路的方法。

脾统血的主要作用机制是（）

A.控制血液的流速

B.控制血液的流量

C.控制血液向外周运行

D.控制血液向内脏运行

E.控制血液在脉中运行

与明代科举相比较，清代科举有哪些变化？