单选题The recording fathometer produces a graphic record of the（）.Abottom contour only up to depths of 100 fathomsBdepth underneath the keel against a time baseCcontour of the bottom against a distance baseDdepth of water against a distance base
单选题
The recording fathometer produces a graphic record of the（）.
A
bottom contour only up to depths of 100 fathoms
B
depth underneath the keel against a time base
C
contour of the bottom against a distance base
D
depth of water against a distance base
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