| | 300 500 | | | | 5 | | | | | | | | | | | | | | | | | | 100 | 5 500 | | 1. | 300 500 | 1 1.5 | | | | | 2. | | | | | | 3. | | | | | | | | | | | | | β- A | | | 5 | | | | | | B | | | | | | | | |