试述沉淀池分类,某城市需建设100万吨/日城市污水处理厂,其二沉池采用哪一种形式的沉淀池?为什么?在该污水厂初沉池设计中,若测得Uo=0.42mm/s,则需沉淀池有效面积为多少?
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什么叫颗粒群最小沉降速度U0?它与沉淀池表面负荷率有怎样的关系?例:某城市污水厂初沉池设计中,测得U0=0.42mm/s,求初沉池表面负荷率;若处理量是8万m3/d则需沉淀池有效面积为多少?(9分)
A: How many vowels are there in English?B: ______________. (空格处请填入阿拉伯数字)
How many kinds of vowels are there in English?1)_________kinds (空格处请填入阿拉伯数字)What are they?2)________________
Llangollen has declared itself a euro zone while it holds its (1)____music festival.