橘红色的橘子圆圆的,像灯笼一样。
____
Jim sold most of his things. He has hardly ______ left in his house.
如图所示,在同一平台上的O点水平抛出的三个物体,分别落到a、b、c三点,则三个物体运动的初速度va,vb,vc的关系和三个物体运动的时间ta, tb, tc的关系分别是( )
一条直线y=kx+b,其中k+b=﹣5、kb=6,那么该直线经过( )