A.1575.42MHz、1227.60MHz B.399.968MHz、149.988MHz C.10.2千赫,13.6千赫,11.33千赫 D.1602MHz+N×0.5625MHz,1246MHz+N×0.4375MHz
A.10 B.20 C.30 D.40
A.24 B.18 C.30 D.48