I am smart and healthy because I have some good habits. I love reading books very much. I think books are important for everyone. A book can tell us a lot, and we can learn a lot from it. I also like playing sports. In the p
学校中部分学生“不受管”,爱与老师对着干,在家里与父母对着干,这种心理属于( )
研制出高产的杂交水稻,被誉为“世界杂交水稻之父”,为世界粮食增产发挥了重要作用的科学家是( )
同学们学过估测爬楼时的功率,如果要估测宝宝爬楼时克服重力做功的功率,你认为要测量下列哪些物理量( )
①宝宝的质量②宝宝的身高③爬楼的长度④爬楼的高度⑤爬楼的时间.