This is a （）(罗兰).

单项选择题This is a （）(罗兰).

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

1.单项选择题Officers use sextants to observe （）.

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

2.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

3.单项选择题The captain wants to see the （）.

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

4.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

5.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

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

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

7.单项选择题（）（电罗经）can tell us true north.

A.VHF
B.Radar
C.Chart
D.Gyro-compass

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

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

9.单项选择题The （）（天线）is like a dish.

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

10.单项选择题This is a radio （）（测向仪）.

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