单项选择题
A. stars B. celestial bodies C. the sun D. the moon
The telegraph is the（）(设备)that connects the engine room...
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
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
