单项选择题
A.1-2GHz B.4-6GHz C.12-14GHz D.20-40GHz
A.120° B.150° C.160° D.180°
A.11300MHz B.11250MHz C.1750MHz D.2225MHz
A.10DB B.5DB C.3DB D.1DB
微信扫一扫,加关注免费搜题
