| | | | | | | | | | 50 | | | | | | | | 12 | 2.4 | | 3 | | 1. | 2. | 3. 20 | 3 10 1.5 | 4. | 5. | | 6. | | 99% | 90% | | | | | | | | | | | 42 2007 25 ~ | 30 | | | | 1. | 2. | | 3. 4. | | | 5. | | | | | |