单选题All echo-sounders can measure the().Aactual depth of waterBactual depth of water below keelCaverage depth from waterline to hard bottomDaverage depth of water to soft bottom
单选题
All echo-sounders can measure the().
A
actual depth of water
B
actual depth of water below keel
C
average depth from waterline to hard bottom
D
average depth of water to soft bottom
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