分类 | Ra/% | pp/(个∙m−1) | Sp/mm2 | Z/1 |
I类溶蚀带 | >35 | >55 | >4000 | >40 |
II类溶蚀带 | 5~35 | 10~55 | 500~4000 | 10~40 |
III类溶蚀带 | <5 | <10 | <500 | <10 |