单选题Which of the following is not a factor which can interfere with the pulse of sound and cause a variation the depth reading?（）AsalinityBtemperatureCthe hydrostatic pressureDVessel’s speed
单选题
Which of the following is not a factor which can interfere with the pulse of sound and cause a variation the depth reading?（）
A
salinity
B
temperature
C
the hydrostatic pressure
D
Vessel’s speed
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