1. Physical value and troop in security practice.
2. Solving practical difficulty in security practice.
3. Characteristics materials.
4. Technical metering.
5. Technical experiment.
6. Mechanical oscillations.
7. Resonance.
8. Mechanical wave.
9. Scan.
10. Electromagnetic radiation.
11. Ionising radiation.
12. Ionizing radiation.
13. Physical field.
2. Solving practical difficulty in security practice.
3. Characteristics materials.
4. Technical metering.
5. Technical experiment.
6. Mechanical oscillations.
7. Resonance.
8. Mechanical wave.
9. Scan.
10. Electromagnetic radiation.
11. Ionising radiation.
12. Ionizing radiation.
13. Physical field.