湿周：在总流过流断面上，液体与固体相接触的线称为湿周。Wet circumference: on the cross section of the total flow, the line between liquid and solid is called wet circumference.
湿周：在总流过流断面上，液体与固体相接触的线称为湿周。Wet circumference: on the cross section of the total flow, the line between liquid and solid is called wet circumference.
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