The recording fathometer produces a graphic record of the（）.
- Abottom contour only up to depths of 100 fathoms
- Bdepth underneath the keel against a time base
- Ccontour of the bottom against a distance base
- Ddepth of water against a distance base
问题
The recording fathometer produces a gr
参考解析：
分类：地文航海题库
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