()


:
:


() () ()
d D
6 6 5.5 9.7 35
8 8 7.8 11.6 40
10 10 9.5 13.9 55
12 12 10.9 15.9 75
15 15 13.9 18.9 75
20 20 18.7 24.0 90
25 25 23.7 30.8 110
32 32 30.4 38.0 150
38 38 36.4 44.0 180
50 50 48.0 58.7 245