一架太原飞往厦门的飞机曾在高空遭遇“鸟击”,机头被撞凹受损.下列关于小鸟和飞机相撞时的说法正确的是( )
A:机头被撞凹受损,说明力可以改变物体的形状
B:小鸟撞飞机的力大于飞机撞小鸟的力
C:小鸟只是施力物体
D:小鸟撞飞机的力和飞机撞小鸟的力是一对平衡力
①立方体静止时对水平地面的压强;
②翻滚立方体时,使立方体一边刚刚离开地面,所用最小力F的大小;
③“大力士”用翻滚的方法使立方体沿直线移动了10m,用时20s,“大力士”克服立方体重力做功的功率.
I am Bill Jones. I am a teacher of English. My wife is Linda Jones. She is a nurse. We have a daughter and a son. We have many friends.Look! These are my friends. This is Mr. Black. He is a worker. He works in a shoe factory He makes shoes there. That’s Mrs. Black. She is a worker on a farm near here. The girl is their daughter. She is a student. She is thirteen. The boy is their son. He is a young soldier(战士). His name is Carl Black.