单项选择题
A.gear B.equipment C.engine D.sextant
The captain wants to see the （）.A. chief officerB. seco...
单项选择题The captain wants to see the （）.
A. chief officer B. second officer C. third officer D. carpenter
Echo sounder sends a（） (无线电信号)from the bottom of the sh...
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
Radar is of great help to ship in poor（）(能见度).A.visibil...
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
