从距离地面5m的高处将质量为0.5kg的物块以5m/s的速度水平抛出,不计空气阻力,g取10m/s2.求:
为什么在与同学的交往中,我们不能封闭自己,而应开放自我?
要防患于未然,我们未成年人就应努力做到( )
—Miss Gao has ____________ free time than Mr Green.—I think so. She is busy every day.