1. Altitude:  1000m;

2. Ambient temperature: -25 ~+40 ;

3. Wind speed:  34m/s (Wind pressure:  700Pa);

4. Ice thickness:  20mm;

5. Relative humidity: daily average 95%, monthly average  90%;

6. Without fiercely shake and impulse;

7. Occasions without flammable, explosive, serious pollution and chemical corrosion.