无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

單項(xiàng)選擇題

Which equipment is not a source of locating signals?()

A.EPIRB's that transmit on 406 MHz
B.Survival craft VHF transceivers that provide a beacon on 121.5 MHz
C.COSPAS-SARSAT EPIRBs
D.SARTs operating on 9 GHz

微信掃碼免費(fèi)搜題