To describe a force, we only need to describe the magnitude that describe "how hard" the force pushes or pulls.
A: 正确
B: 错误
A: 正确
B: 错误
举一反三
- To describe a force, we only need to describe the magnitude that describe "how hard" the force pushes or pulls.
- When we describe a device, we need to describe every components in detail.
- The magnitude of the internal force of a bar depends on not only the external force but also the shape of its cross section. A: 正确 B: 错误
- We can only describe the direct impression of a person or object. （ )
- How to describe a product?