A. starsB. celestial bodiesC. the sunD. the moonOfficer……

单项选择题The telegraph is the（）(设备)that connects the engine room and the bridge.

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

单项选择题The captain wants to see the （）.

A. chief officer
B. second officer
C. third officer
D. carpenter

单项选择题Echo sounder sends a（） (无线电信号)from the bottom of the ship to the seabed.

A. radio signal
B. radio wave
C. signal
D. signal radio

单项选择题Radar is of great help to ship in poor（）(能见度).

A.visibility
B.VHF
C.visible
D.compass

单项选择题Navigators use navigational aids, such as（）（罗经）.

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