[題目] 白努力定律的題目
河流在上游的寬度為40m且水深2.2m,下游寬度變窄為4.5m。若量測得上下游的流速
分別為4.5m/s及8.0m/s,請估計下游的深度為多少?
(A)10m (B)11m (C)12m (D)15m
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