搜题请搜索小程序“爱下问搜题”
问题 解答题

要制作两个形状相同的三角形框架，其中一个三角形框架的三边长分别为4、5、6，另一个三角形框架的一边长为2，它的另外两边长分别可以为多少？

答案

题中没有指明边长为2的边与原三角形的哪条边对应，所以应分别讨论：

（1）若边长为2的边与边长为4的边相对应，则另两边为

5
2
和3；

（2）若边长为2的边与边长为5的边相对应，则另两边为

8
5
和
12
5
；

（3）若边长为2的边与边长为6的边相对应，则另两边为

4
3
和
5
3
．

故三角形框架的两边长可以是：

5
2
和3或
8
5
和
12
5
或
4
3
和
5
3
．

填空题

Part 4


Questions 26-45


·Read the following passage and choose the best word for each space.
·For questions 26-45, mark one letter A, B, C or D on the Answer Sheet.
During the past ten years (26) attention has been given to "telling it like it is". My impression is that this devotion to (27) one’s mind has more often led to hurt feelings and ruined relationships than (28) great joy.
I think we generally agree that never expressing real feelings and (29) all less-than-lovely thoughts about each other always leads to constructive communication. It’s a great (30) to allow ourselves to admit our human weaknesses and pursue more honest relationships with others. (31) we need to keep a balance between telling it all and telling nothing.
Recently I received a letter from a mother who had been (32) by her son to attend a weekend meeting with him. Under pressure from the group, her defenses cracked and she heard herself (33) her son for the first time that he (34) an accident—that she hadn’t been planning to have a child. He (35) told her that he couldn’t recall a single day in his childhood that he’d been happy. We cried and (36) ; I thought telling the truth had been good for us. But the trouble is, it wasn’t the whole truth. By the time Tommy was born I did want him, and at (37) he was happy. Ever since that day, we (38) . by some terrible feelings we exchanged. I must admit I’ve (39) the conclusion that some things are better left uncovered. Honesty is a fine policy, but we need a new sense of (40) . Disclosing is not a solution to every problem (41) even an end in itself. It’s useful under some circumstances and terribly hurtful under (42) . It’s a good idea, I think, to bite your (43) for ten or fifteen minutes before saying what’s (44) your mind. Try to decide whether it’s going to open up new and better ways of communication or (45) wounds that may never heal.

A．in

B．of

C．on

D．from
查看答案
单项选择题

心交感神经末梢释放()

A．去甲肾上腺素

B．血管紧张素

C．肾上腺素

D．乙酰胆碱

E．组胺
查看答案