... effective destruction of bridges, solve the congestion problem; 2. combination of air Cannon, a large Air Cannon ... equivalent circle, regarding 60 cone angle as benchmark..2. D is the average granularity of materials.3. Massive ... material is according to D=30μm.4. Choosing accords to the diameter, ... , volume, and angel of bin.5. When D≥800, the number should be decided accords to ...