——What does your Chinese teacher look like?
——_________.
A:She likes reading
B:She's tall and thin
C:She's thirty
D:She's very good
已知:方程x+k=2的解比方程 12 x﹣k+3=2k的解大1,求k的值.
如图所示,用10 N的水平力将重9 N的物体压在竖直墙壁上静止不动,物体与墙壁的接触面积为0.01m2,则物体对墙壁的压力为____N,压强为____Pa,物体受到的摩擦力大小是____N.
下列河流中,冬季有结冰现象的是( )