| 1. | | | | | | | | | | | | | | | | | | 2. | 1 | | | 2 | | 3 | | 4 1 | 1 2 | 15~30 | 5 10 15 | 1 3 5 | 50% 500 ~ 800 70% | 600~800 50% 800~1000 | | |