单选题In motorships，there are two main circuits, （）.Aone salt water, one fresh waterBone salt water, one fuelCone fresh water, one fuelDone steam, one fuel
单选题
In motorships，there are two main circuits, （）.
A
one salt water, one fresh water
B
one salt water, one fuel
C
one fresh water, one fuel
D
one steam, one fuel
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