1. First, download and install the 99 Wang Zhi software, and then open the software. After entering the software, enter the settings page.

2. Then you can see an industry and trade practice at the bottom of the page, and click enter.

3. On the practice page, you can see that there is a physical option at the top. Click to enter.

4. Then choose the topic chapter according to your own needs, and click the answer at the back to enter the answer page.