如图所示,A是地球的同步卫星,另一卫星B的圆轨道位于赤道平面内,离地面高度为h。已知地球半径为R,地球自转角速度为ω0,地球表面的重力加速度为g,O为地球中心。 (1)求卫星B的运行周期;(2)如卫星B绕行方向与地球自转方向相同,某时刻A、B两卫星相距最近(O、B、A在同一直线上),则至少经过多长时间,它们再一次相距最近? 35.[1998上海]—I was so sure
that our experiment was going to succeed, but something went wrong at the last
minute.
—________ ,
but don't give it up. Try again.
A. You don't mean that
B. Find out the reason
C. Never mind
D. I'm sorry to hear that