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Reverse-osmosis freshwater generators usually feature multiple membrane modules, typically of the spiral-wound membrane type. How are these multiple membrane modules piped?
A) The multiple membrane modules are always connected in parallel.
B) The multiple membranes may be connected in series, parallel, or in some combination of series and parallel.
C) The multiple membrane modules are always connected in series.
D) The multiple membranes may be connected in series or parallel, but never in some combination of series and parallel.
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