人造卫星沿椭圆轨道绕地球运行时，在它从近地点向远地点运动过程中，下列说法中正确的是

题干

人造卫星沿椭圆轨道绕地球运行时，在它从近地点向远地点运动过程中，下列说法中正确的是（）

A：动能增大，势能减小，机械能不变

B：动能减小，势能增大，机械能不变

C：动能不变，势能增大，机械能变大

D：动能减小，势能不变，机械能变小

上一题下一题 0.0难度选择题更新时间:2018-02-13 09:01:30

B

What's your favourite festival? Why do you love it? Let's look at Wendy's favourite festival.

Name	Wendy Roberts	Age	14
School	Woody Middle School
Favourite festival	Thanksgiving Day	Date	The 4th Thursday in November
Reasons: ⒈I have a big family. All my family members go to my grandparents' home this day. We have a good time. Every year we take a lot of family photos. ⒉I can eat my favourite food — turkey (火鸡). The turkey is too big, and we can't eat it up (吃完) at a time. So I can enjoy it in the next two days. ⒊We have a family football game. Boys in my family love it best. We watch or play football together. ⒋Christmas will come in one month after Thanksgiving Day. That is to say, my long winter holiday is coming.