一行星绕恒星作圆周运动.由天文观测可得,其运动周期为T,速度为v,引力常量为G, 发布时间:2017-06-09 06:43 │ 来源:www.tikuol.com 题型:填空题 问题: 一行星绕恒星作圆周运动.由天文观测可得,其运动周期为T,速度为v,引力常量为G,则恒星的质量为 ,行星运动的轨道半径为 .
题型:填空题 –How old is your daughter? -- ______ . We had a special party for her _____ birthday last week.A.Ninth; ninthB.Nine ; ninethC.Ninth; nineD.Nine; ninth 查看答案