（）（电罗经）can tell us true north.

单项选择题Officers observe ships with a pair of （）（望远镜）.

A.sextant
B.binoculars
C.compass
D.radar

单项选择题The （）（天线）is like a dish.

A.line
B.thread
C.aerial
D.wire

单项选择题This is a radio （）（测向仪）.

A.compass
B.direction finder
C.loran
D.sextant

单项选择题The ship’s（）（天文钟）is a very accurate clock.

A.watch
B.chronometer
C.time
D.clock

单项选择题The bosun is good at（）(打绳结).

A. knotting line
B. making knots
C. knots
D .making line