—Could I swim here?
— .Look at the sign NO SWIMMING.
A:No,you couldn't
B:Certainly,you could
C:Sorry,please don't
D:Of course,you can
如图,函数y=k(x+1)与 y=kx (k<0)在同一坐标系中,图像只能是下图中的( )
下列物理量中,属于标量的是( )