| | | | O1 O2 O78 | | | | | | | | | | | | | | | | | | | | | | | 1 0.1％ ~0.2％ | 3 ~ 5 | 2 5000 ~ 8000 | 2 3 | 3 3000 | 2 3 | 4 0.1％ 5 | | 5 0.03％ ~ 0.04％ | 3 ~ 5 | 6 0.05％ ~0.1％ | 5 | 7 | | | |