人教版英语三年级下册71

1个回答2024-04-26 06:18

下列说法正确的是( B )
A、平移不改变图形的形状和大小，而旋转则改变图形的形状和大小
B、平移和旋转的共同点是改变图形的位置
C、图形可以向某方向平移一定距离，也可以向某方向旋转一定距离
D、由平移得到的图形也一定可由旋转得到

考点:旋转的性质;平移的性质.分析:根据平移和旋转的性质，对选项进行一一分析，排除错误答案.解答:解:A、平移不改变图形的形状和大小，而旋转同样不改变图形的形状和大小，故错误;
B、平移和旋转的共同点是改变图形的位置，故正确;
C、图形可以向某方向平移一定距离，旋转是围绕中心做圆周运动，故错误;
D、平移和旋转不能混淆一体，故错误.
故选B.
这样的解释不具有说服力，尤其是选项B，C，我希望得到具有说服力的解释。
A，D不说了，B选项，旋转改变图形的位置，我举个例子，一个圆，绕圆心(也就是旋转中心)旋转360度，旋转后的图形不是和原图形完全重合了吗?有2个质疑点，1，该圆在旋转的过程中位置的确发生了改变。2，该圆旋转后的结果，位置并没有发生改变。所以我认为选项B的提问不确切。谁来给我解释一下为什么选项B正确，让我心悦诚服呢?选项C，举个例子，如果一个三角形abc围绕三角形外一点(也就是旋转中心)旋转30度，得到旋转后的三角形a1b1c1，那么三角形a1b1c1与原三角形之间不是存在距离吗?就是2个三角形对应顶点的连线的长度，谁能解释一下，为什么错呢?希望你的答案能让我心悦诚服。

看听学第一册71课

1个回答2022-09-26 08:36

这个你不知道么~~~~去网上找啊~~~~~

一年级上册数学书71页怎么做？

2个回答2023-01-09 11:12

5.一共有10瓶水，小鹿喝了3瓶，还剩多少瓶？
10-3=7(瓶)
6.有6只小猴在划船，又来了2只，现在一共有多少只？
6+2=8(只)

成语消消看》71关答案是什么 71关答案大全介

1个回答2024-01-24 02:07

厉兵秣马、恩同再生、诸子百家
不可一世、门当户对、空穴来风
耳鸣目眩、敬谢不敏、觥筹交错
耳目喉舌。

连环画《格林童话-第十本》之70、71册

1个回答2023-12-23 07:32

第70册

................................................................................

第72册

病人是一个71岁的老太太

1个回答2024-01-20 07:09

你好,可能是心肌缺血或者心肌病,建议做踏步心电图、心肌酶和心脏彩超检查。

读老子学成语71一74

1个回答2024-01-28 00:55

　　哀兵必胜原意是力量相当的两军对阵，悲愤的一方获得胜利。后指受欺侮而奋起抵抗的军队，必定能取胜。
　　爱素好古指爱好朴质，不趋时尚。
　　安居乐业安：安定；乐：喜爱，愉快；业：职业。指安定愉快地生活和劳动。
　　暴风骤雨暴、骤：急速，突然。又猛又急的大风雨。比喻声势浩大，发展急速而猛烈。
　　不可名状名：用言语说出；状：描绘，形容。无法用语言来形容。
　　长生久视久视：不老，耳目不衰。形容长寿。
　　宠辱若惊无论受宠、受辱，心里都要振动。形容人非常计较得失。
　　出生入死原意是从出生到死去。后形容冒着生命危险，不顾个人安危。
　　寸进尺退前进一寸，后退一尺。指得到的少而失去的多，即得不偿失。
　　大辩若讷讷：语言迟钝，不善于讲话。真正有口才的人表面上好像嘴很笨。表示善辩的人发言持重，不露锋芒。
　　大器晚成大器：比喻大才。指能担当重任的人物要经过长期的锻炼，所以成就较晚。也用做对长期不得志的人的安慰话。
　　大巧若拙拙：笨。指真正聪明的人，不显露自己，从表面看，好象笨拙。
　　独异于人独：独自，单独；异：不同。独自与别人不同的。一般指不同于世俗。
　　多藏厚亡厚：大；亡：损失。指积聚很多财物而不能周济别人，引起众人的怨恨，最后会损失更大。
　　福兮祸所伏，祸兮福所倚指福祸互为因果，互相转化。
　　福倚祸伏指福祸互为因果，互相转化。
　　腹中兵甲兵甲：即甲兵，穿着盔甲的士兵。腹中装有士兵。比喻人有雄才谋略。
　　根深蒂固比喻基础深厚，不容易动摇。
　　功成不居居：承当，占有。原意是任其自然存在，不去占为己有。后形容立了功而不把功劳归于自己。
　　功成身退身：自身，自己。指大功告成之后，自行隐退，不再复出。

新概念英语第一册 67 69 71原文

1个回答2022-08-04 03:33

Lesson 67 The weekend

周末

Listen to the tape then answer this question. What are the Johnsons going to do at the weekend?
听录音，然后回答问题。约翰逊夫妇周末准备做什么?

MRS.JOHNSON: Hello. Were you at the butcher's?
MRS.WILLIAMS: Yes. I was. Were you at butcher's, too?
MRS.JOHNSON: No, I wasn't. I was at the greengrocer's.
How's Jimmy today?
MRS.WILLIAMS: He's very well, thank you.
MRS.JOHNSON: Was he absent from school last week?
MRS.WILLIAMS: Yes, he was.
He was absent on Monday, Tuesday, Wednesday and Tuesday.
How are you all keeping?
MRS.JOHNSON: Very well, thank you.
We're going to spend three days in the country.
We're going to stay at my mother's for the weekend.
MRS.WILLIAMS: Friday, Saturday and Sunday in the country!
Aren't you lucky!

Lesson 69 The car race

汽车比赛

Listen to the tape then answer this question. Which car was the winner in 1995?
听录音，然后回答问题。哪辆车在1995年的比赛中获胜?

There is a car race near our town every year. In 1995, there was a very big race.
There were hundreds of people there. My wife and I were at the race. Our friends Julie and Jack were there, too. You can see us in the crowd. We are standing on the left.
There were twenty cars in the race. There were English cars, French cares, German cars. Italian cars. American cars and Japanese cars.
It was an exciting finish. The winner was Billy Stewart. He was in car number fifteen. Five other cars were just behind him_
On the way home, my wife said to me, 'Don't drive so quickly! You're not Billy Stewart!'

Lesson 71 He's awful!

他讨厌透了!

Listen to the tape then answer this question. How did Pauline answer the telephone at nine o'clock?
听录音，然后回答问题。波淋在9点接电话时是如何说的?

JANE: What's Ron Marston like, Pauline?
PAULINE: He's awful!
He telephoned me four times yesterday, and three times the day before yesterday.
PAULINE: He telephoned the office yesterday morning and yesterday afternoon.
My boss answered the telephone.
JANE: What did your boss say to him?
PAULINE: He said, "Pauline is typing letters. She can't speak to you now!"
PAULINE: Then I arrived home at six o'clock yesterday evening. He telephoned again.
But I didn't answer the phone!
JANE: Did he telephone again last night?
PAULINE: Yes, he did. He telephoned at nine o'clock.
JANE: What did you say to him?
PAULINE: I said, 'This is Pauline's mother. Please don't telephone my daughter again!'
JANE: Did he telephone again?
PAULINE: No, he didn't!