A:had played; did
B:played; did
C:had played; was going to do
D:was playing; was going to do
关于如图中两工业基地的共同特点,叙述错误的是( )
一物体做匀变速运动,在3s内从10m/s减小到1m/s,方向不变,求加速度大小( )