组数 | a/mm | b/mm | Cf/mm | Cr/mm | e |
A | 2.25 | 2.5 | 2.5 | 7 | 0.5825 |
B | 1.5 | 3 | 2 | 8 | 0.8288 |
C | 1.25 | 1.5 | 4 | 11 | 0.9620 |