A:地面受到的滑动摩擦力为7N
B:滑轮移动的速度为0.4m/s
C:水平拉力F做功的功率为2.8W
D:在2s内绳子对物体A所做的功为2.8J
下面有关我国海洋国土的叙述,不正确的是( )
Mrs. Green didn't talk to her husband for a long time, but now they ____ each other.