材质 
M3
0.5
5.1
4.9
5.5
5
6.7
6.3
0.83
0.67
0.85
0.75
1.4
0.8
M4
0.7
6.1
5.9
6.5
6
7.7
7.3
0.83
0.67
0.85
0.75
1.4
0.8
M5
0.8
7.2
7.0
8
7.5
9.2
8.8
0.83
0.67
0.9
0.8
1.4
0.8