- Who's that woman? ( )
- _____ is my mother.
A:She
B:He
C:This
关于下图所示国家的叙述,不正确的是( )
一 Could you tell me ? I must find him.
一Sorry, I'v no idea. But he was here just now.
甲、乙两车通过的路程之比为3:2,运动的时间之比为2:1,则甲、乙两车的速度之比是( )
竖直起飞的火箭在推动力F的作用下产生10m/s2的加速度,若推动力增大到2F,则火箭的加速度将达到( )(g取10m/s2)