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#13772 Bangla Language & Literature আধুনিক পদার্থ বিজ্ঞান Level 0

একটি d diameter - এর Circular pipe- এ Hydraulic mean Depth হলো ---

A $\frac{d}{2}$
B $\frac{d}{4}$
C $\frac{d}{6}$
D d

Answer: B - $\frac{d}{4}$

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