An electronic depth finder operates on the principle that（）.<br>A:radio signals reflect from a solid surface<br>B:sound waves travel at a constant speed through water<br>C:radar signals travel at a constant speed through water<br>D:pressure increases with depth

An electronic depth finder operates on the principle that（）.
A:radio signals reflect from a solid surface
B:sound waves travel at a constant speed through water
C:radar signals travel at a constant speed through water
D:pressure increases with depth

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