新构造运动的运动形式有()、(),()的幅度和速度大。
参考答案:升降运动,水平运动,水平运动
用正确的物主代词填空。
1. I am in Class 2. This is _____ class.
2. Wang Hong, is this _____ bag?
3. The boy is my friend. _____ name is Tom.
4. This is a bird. _____ name is Polly.
5. The girl is Lucy. _____ bag is yellow
如图所示,请画出铡刀铡物体时动力F1的力臂l1和阻力F2的力臂l2.