单项选择题
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
This is a radio （）（测向仪）.A.compassB.direction finderC.lo...
单项选择题This is a radio （）（测向仪）.
A.compass B.direction finder C.loran D.sextant
The ship’s（）（天文钟）is a very accurate clock.A.watchB.chro...
单项选择题The ship’s（）（天文钟）is a very accurate clock.
A.watch B.chronometer C.time D.clock
