题干

细心观察图形,认真分析各式,然后解答问题.

OA22=( 12+1=2,S1=

1
2

OA32=12+( 22=3,S2=

2
2

OA42=12+( 32=4,S3=

3
2

…..

上一题 下一题 0.0难度 选择题 更新时间:2019-05-05 07:40:43

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我国研制的“嫦娥三号”月球探测器于2013年12月1日发射成功,并成功在月球表面实现软着陆.探测器首先被送到距离月球表面高度为H的近月轨道做匀速圆周运动,之后在轨道上的A点实施变轨,使探测器绕月球做椭圆运动,当运动到B点时继续运动,探测器携带的传感器测得自由落体运动时间为t,已知月球半径为R,万有引力常量为G.则下列正确的是(   )

同类题2

根据短文内容,回答问题

    Hello, everybody. My name is Xie kai. I was born on March ninth, 1990. I'm in a middle school in Xinle City. I like our school very much.

    Today is Monday, October 27th. This is the busiest day in the week. In the morning, at 8:00 I have Chinese. Chinese lesson is interesting. Our Chinese teacher, Mr. Wang, has a good way to make his lesson interesting. All the students in our class like him a lot. Then at 9 o'clock, we have math. I don't like math, because it's difficult. Next, at 10:10, I have English. I like English very much. And at 11:10, I have P.E. That's my favorite subject. I have lunch at 12 o'clock. In the afternoon, I have two lessons. At 2:00, I have science. It's difficult, but interesting. After that I have music. Music is relaxing. I like my music teacher, too. She is young and beautiful. Then we can go to different clubs. I'm in a soccer club. Soccer is my favorite sport.

同类题3

 为执行中央“节能减排,美化环境,建设美丽新农村”的国策,我市某村计划建造AB两种型号的沼气池共20个,以解决该村所有农户的燃料问题.两种型号沼气池的占地面积、使用农户数及造价见下表:

型号
占地面积
(单位:m2/个 )
使用农户数
(单位:户/个)
造价
(单位: 万元/个)
A
15
18
2
B
20
30
3

已知可供建造沼气池的占地面积不超过365m2,该村农户共有492户.
(1)满足条件的方案共有几种?写出解答过程.
(2)通过计算判断,哪种建造方案最省钱?造价最低是多少万元?

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国庆节到来之前,我们应该设计好活动方案。(   )

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.
It was with these feelings _______ I began the creation of a human being.
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