- 02
- Mar
pintu api daun tunggal, pintu baja api, pintu nilai api
Miturut macem-macem resistance geni saka lawang geni baja, resistance geni bisa dipérang dadi telung gelar: A, B, lan c. Lawang geni baja saka macem-macem gelar bisa digunakake ing macem-macem panggonan.
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