| brand | Shuang |
|---|---|
| Color classification | Time-limited specialty: mentor one-on-one instruction package club The following is ↓( Textbook Synchronous Professional Edition) Elementary School Junior High School High School University ( Textbook Professional Edition)20000 |
| Production enterprise | Xinyi Co., Ltd |
10,000 elementary school students in the Children's Science Experiment of Optical Microscope Biology Junior high school electronic desktop professional level visible sperm handheld 8 high times high-definition mobile phone portable bacteria
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