A Doppler log in the bottom return mode indicates the（）.<br>A:velocity of the current<br>B:bottom characteristics<br>C:depth of the water<br>D:speed over the ground

A Doppler log in the bottom return mode indicates the（）.
A:velocity of the current
B:bottom characteristics
C:depth of the water
D:speed over the ground

出自：海船船员证

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