Echo sounder sends a (无线电信号)from the bottom of the ship to the seabedA.radio signalB.radio waveC.signalD.signal radio
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
相关考题:
A wise mother never ______ her children to the slightest possibility of danger. (A) exposes(B) makes(C) sends(D) lets
A vessel in distress should send by radio telephone the two tone alarm signal followed immediately by the ______.A.distress positionB.spoken words “Mayday, Mayday, Mayday”C.ship’s nameD.ship’s call letters
1、如果操作员要查找广州海岸电台相关资料,它可以查阅()A.《无线电信号表》第1卷B.《无线电信号表》第2卷C.《无线电信号表》第3卷D.《无线电信号表》第4卷