问题
单项选择题
A Doppler speed log indicates speed over ground（）.
A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current
答案
参考答案：B
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A Doppler speed log indicates speed over ground（）.
A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current
参考答案：B