A:has been reached
B:had been reached
C:has reached
D:had reached
细胞分化不同于细胞增殖的主要特点是( )
如图甲所示,物体甲重30N,被20N的水平压力F甲压在竖直墙壁上保持静止。如图乙所示,物体乙重40N,在15N的水平拉力F乙作用下,沿水平桌面匀速向右运动.则物体甲受到的摩擦力f甲为____ N,物体乙受到的摩擦力f乙为____ N.