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A.excessive loads are placed on the winch
B.minimum pull is being exerted by the winch
C.automatic operation of the winch is desired
D.wire is being retrieved at the maximum rate

A.less internal corrosion because of lower brine density
B.higher temperature evaporation for lower salinity of the distillate produced
C.less scale formation in a flash evaporator
D.less feed-water required for a flash evaporator