| 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 | | |