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單項(xiàng)選擇題

This is a radio （）（測(cè)向儀）.

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

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單項(xiàng)選擇題

The ship’s（）（天文鐘）is a very accurate clock.

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

單項(xiàng)選擇題

The bosun is good at（）(打繩結(jié)).

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