Which factor has the greatest effect on the amount of gain required to obtain a fathometer reading?（）<br>A:Salinity of water<br>B:Temperature of water<br>C:Atmospheric pressure<br>D:Type of bottom

Which factor has the greatest effect on the amount of gain required to obtain a fathometer reading?（）
A:Salinity of water
B:Temperature of water
C:Atmospheric pressure
D:Type of bottom

出自：海船船员证

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