单项选择题
A.sextant B.binoculars C.compass D.loran
（）（电罗经）can tell us true north.A.VHFB.RadarC.ChartD.Gyro...
单项选择题（）（电罗经）can tell us true north.
A.VHF B.Radar C.Chart D.Gyro-compass
Officers observe ships with a pair of （）（望远镜）.A.sextant...
单项选择题Officers observe ships with a pair of （）（望远镜）.
A.sextant B.binoculars C.compass D.radar
The （）（天线）is like a dish.A.lineB.threadC.aerialD.wire
单项选择题The （）（天线）is like a dish.
A.line B.thread C.aerial D.wire
