A:Yes, I did
B:No, I didn't
C:Yes, I have
D:Why? Sound strange
下列说法不正确的是( )
关于物体的内能、温度和分子的平均动能,下列说法正确的是( )
方程x=x(x﹣1)的根是( )
Running is good e____. It's good for our health.