1, the copper wire package has a good effect in Kaifeng

2, the complexity of the sample of Kaifeng is very convenient

3, repeatability, high consistency

4, computer control of the shape of Kaifeng, location, size, time, etc., easy to operate

5, the environment and human pollution damage is small, high security

6, almost no material, the use of low cost

7, small size, easy to display