At 4:00 next Friday, I _______TV in my room.
A:am watching
B:will be watching
C:will have watched
D:will been watched
下列预防传染病的措施中,属于切断传播途径的是( )
读“地球自转示意图”,完成问题.
用如图甲、乙两种方式匀速提升重为100N的物体,已知滑轮重20N,绳重和摩擦力不计。则()