單項選擇題

This is a （）(羅蘭).

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

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單項選擇題

Officers use sextants to observe （）.

A. stars
B. celestial bodies
C. the sun
D. the moon

單項選擇題

The telegraph is the（）(設(shè)備)that connects the engine room and the bridge.

A.gear
B.equipment
C.engine
D.sextant