Because it is a special system, it is redistributed. It may have been activated, so it appears as activated. Each activation code can only be activated once, and then it will be invalid.

Systematic anatomy is a kind of human anatomy. It is human anatomy described according to human organ systems (such as motor system, digestive system, respiratory system, urinary system, reproductive system, endocrine system, circulatory system, sensory organs and nervous system, etc.). ).

After buying a systematic anatomy book, there will be an activation code at the back of the book. Scan code to download "people's health value-added books" has an "activate" button in the upper right corner of the APP homepage. Scrape the activation code on the book, click the "activate" button of the APP, and enter the activation code to activate.