A.填料壓蓋緊固太松B.填料切口未處理好C.壓蓋螺釘緊固不均勻D.填料安裝時(shí)未抹黃油
A.0~10%B.10%-20%C.20%-30%D.30%-40%
A.利用回流泥渣提高凈水效果B.間歇運(yùn)轉(zhuǎn)會(huì)引起泥渣的沉淀和老化C.不易排除泥渣D.多余的泥渣從懸浮層進(jìn)人濃縮室