One Question per Day ---------- Multiple-choice Questions on Basic Process Knowledge (October 10)
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Participation earns a 3-wealth reward. Multiple-choice question: For non-circular pipes, the equivalent diameter is equal to four times the flow cross-sectional area divided by the wetting perimeter. A is greater than ； B is less than ； C equals ； D is approximately equal to
C is equal to, for non-circular tubes, four times the flow cross-sectional area divided by the wetting perimeter (C equals). A is greater than ； B is less than ； C equals ； D is approximately equal to
For non-circular tubes, it is the flow cross-sectional area four times the equivalent diameter (C) divided by the wetting perimeter. A is greater than ； B is less than ； C equals ； D is approximately equal to