单选题An electronic depth finder operates on the principle that（）.Aradio signals reflect from a solid surfaceBsound waves travel at a constant speed through waterCradar signals travel at a constant speed through waterDpressure increases with depth
单选题
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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