| 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 | |