组装以性能为最重要目标的高性能计算机时，应使用以下如种磁盘？（） A.USB2.0

已知△ABC的面积为2 2 ，内角A，B，C的对边分别为a，b，c，已知a=3，b=4，0＜C＜90°． （1）求sin（A+B）的值；    （2）求cos(2C+ π 4 )的值； （3）求向量 CB ， AC 的数量积 CB • AC ．

女性，43岁，已婚，公务员。近5年来，坚信本单位同部门的两个同事嫉妒自己能力强，因此采取多种方式来恶意陷害、诬陷自己，因此搜集了很多所谓的证据、多次向领导反映、向法院诉讼，家人、朋友解释劝说都无法阻止其上诉。患者一直坚持工作，与其他大多数同事尚能正常交往。该患者最可能的诊断是（）

A.心境障碍

B.妄想性障碍

C.精神分裂症

D.急性短暂性精神障碍

E.无精神病

废铜屑制硫酸铜，小花同学方案为铜与浓硫酸反应，其反应原理是：Cu+2H₂SO₄（浓）

△   .

CuSO₄+X↑+2H₂O．小朵同学方案为：2Cu+O₂

△   .

2CuO，CuO+H₂SO₄=CuSO₄+H₂O．

则X是______（写化学式），较好的方案是______，其优点有（1）______，（2）______．

完形填空。
A young student was one day taking a walk with a professor, who was commonly    1   the students' friend. As they went  2  , they saw lying in the path a pair of old shoes, which they supposed to   3   a poor man who was employed in a field     4   . The student turned to the professor, saying,"Let us play the man   5   : we will hide his shoes, and   6   ourselves behind those bushes, and wait to see his  7   when he cannot find them. "     "My young friend," answered the professor, "we should never   8   ourselves at the   9   of the poor. But you are  10 , and may give yourself a much greater   11   by means of the poor man. Put a coin into each shoe, and then we will hide ourselves and   12  how the discovery affects him. " The student did so, and they both placed themselves behind the bushes. The poor man soon finished his work and  13  the field to the path  14  he had left his coat and shoes. While  15  his coat he slipped his foot into one of his shoes; but feeling something   16 ,  he stooped down (弯下腰) to feel  17  it was, and found the coin. Astonishment and wonder were seen upon his countenance(面部表情). He then looked around him on all sides, but no person was to be seen. He now put the money into his pocket, and proceeded to put on the other shoe; but his surprise was  18 on finding the other coin. He fell upon his knees, looked up to heaven and uttered aloud a fervent (热烈的) thanksgiving,  in which he   19   his wife, sick and helpless, and his children without brea d. The student stood there   20   affected, and his eyes filled with tears.
( )1. A. held       ( )2. A. along       ( )3. A. get to     ( )4. A. close by   ( )5. A. a game     ( )6. A. hide       ( )7. A. pleasure   ( )8. A. make       ( )9. A. money       ( )10. A. poor       ( )11. A. pleasure   ( )12. A. notice     ( )13. A. came about ( )14. A. where     ( )15. A. wearing   ( )16. A. soft       ( )17. A. what       ( )18. A. increased ( )19. A. spoke of   ( )20. A. heavily	B. kept         B. on           B. stick to     B. far         B. a trick     B. have         B. sorrow       B. treat       B. expense     B. kind         B. money       B. watch       B. came across B. on which     B. dressing     B. terrible     B. how         B. put         B. told of     B. slightly	C. named             C. over             C. belong to         C. faraway           C. a joke           C. let               C. disappointment   C. amuse             C. value             C. honest           C. thought           C. observe           C. came into         C. there             C. putting on       C. strange           C. whether           C. doubled           C. talked about     C. easily	D. called         D. back           D. object to     D. near           D. a word         D. make           D. anxiety       D. laugh         D. pay           D. rich           D. good           D. see           D. came by       D. which         D. changing       D. hard           D. why           D. reduced       D. said about     D. deeply

对汛期高度危险地段、严重危石处所，必须派人（）。

A、检查

B、定时检查

C、看守监护