单选题Which factor has the greatest effect on the amount of gain required to obtain a fathometer reading?（）ASalinity of waterBTemperature of waterCAtmospheric pressureDType of bottom
单选题
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
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