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

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

出自：海船船员证

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