A Doppler speed log indicates speed through the water（）.<br>A:at all times<br>B:in the bottom return mode<br>C:in the volume reverberation mode<br>D:only when there is no current

A Doppler speed log indicates speed through the water（）.
A:at all times
B:in the bottom return mode
C:in the volume reverberation mode
D:only when there is no current

出自：海船船员证

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