2007年10月24日18时05分，我国成功发射了“嫦娥一号”探月卫星，11月5日进入月球轨道后，经历3次轨道调整，进入工作轨道。若该卫星在地球表面的重力为G1，在月球表面的重力为G2，已知地球半径为R1，月球半径为R2，地球表面处的重力加速度为g，则 [ ]
A．月球表面处的重力加速度g月为
B．月球的质量与地球的质量之比为
C．卫星在靠近月球表面轨道上做匀速圆周运动的周期T月为2π
D．月球的第一宇宙速度与地球的第一宇宙速度之比为
AC
Sunny School is a bilingual （双语的）school for children between 6－15. We want a cook, a librarian （图书管理员）, a sports coach , and a language teacher.
A. A five-year-old child B. An eight-year-old girl C. A fourteen-year-old child 小题2:Sunny School doesn’t need ________. A. a P.E. teacher B. an English teacher C. a math teacher 小题3:_______ may not speak English in Sunny School. A. The Chinese teacher B. The cook C. The librarian 小题4:The sports coach can play _______ very well. A. volleyball B. chess C. soccer 小题5:If a person wants to be a language teacher in Sunny School, he must ______. A. be able to speak both English and Chinese B. be kind and patient C. Both A and B |