人造地球卫星的轨道半径越大,则( ) A.速度越小,周期越小 B.速度越小,周期 发布时间:2017-06-10 20:23 │ 来源:www.tikuol.com 题型:选择题 问题: 人造地球卫星的轨道半径越大,则( )A.速度越小,周期越小B.速度越小,周期越大C.速度越大,周期越小D.速度越大,周期越大
题型:选择题 选出错误的选项并改正。( ) 1. My grandmother has gray hair and wears glass. _______________ A B C ( ) 2. How many peoples in your family wear glasses? _______________ A B C ( ) 3. He has short hair. His eyes is brown. _______________ A B C ( ) 4. What do they looks like? They are tall. _______________ A B C ( ) 5. She is twelve year old. _______________ A B C 查看答案