免执照的20个频点 是那20个?

1-409.7500
2- 409.7625
3- 409.7750
4- 409.7875
5- 409.8000
6- 409.8125
7- 409.8250
8- 409.8375
9- 409.8500
10- 409.8625
11- 409.8750
12- 409.8875
13- 409.9000
14- 409.9125
15- 409.9250
16- 409.9375
17- 409.9500
18- 409.9625
19- 409.9750
20- 409.9875