单项选择题

不属于平流式沉淀池进水装置的是 A.
横向潜孔 B.
竖向潜孔 C.
穿孔墙 D.
三角堰

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多项选择题

What are the characters of stiff materials?

A．Low Yield Strength
B．Low Young’s Modulus
C．High Bonding Energy within the Material
D．High Elastic Modulus

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