The recording fathometer produces a graphic record of the（）.<br>A:bottom contour only up to depths of 100 fathoms<br>B:depth underneath the keel against a time base<br>C:contour of the bottom against a distance base<br>D:depth of water against a distance base

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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