-_________ weather it is! We can't go boating on the Xuanwu Lake.
-Don't worry. Let's go to the Science Museum instead.
A:What good
B:How good
C:How had
D:What bad
木星是太阳系中最大的行星,它有众多卫星.观察测出:木星绕太阳做圆周运动的半径为r1、周期为T1;木星的某一卫星绕木星做圆周运动的半径为r2、周期为T2.已知万有引力常量为G,则根据题中给定条件,下列说法正确的是( )
默写填空。