JY 0012-1990
Magnetic needle (English Version)
- Standard No.
- JY 0012-1990
- Language
- Chinese, Available in English version
- Release Date
- 1990
- Published By
- Professional Standard - Education
- Latest
- JY 0012-1990
JY 0012-1990 history
- 1990 JY 0012-1990 Magnetic needle
