The nitrogen source's effects on the purification performance of air phase trickling biofilter are significant.
2
系每一种渗滤冲煮方法（滴滤、虹吸等）中，用过既咖啡粉床既形状是判断水流既均匀性既一个重要参考物。
In every percolation brewing method (drip, siphon, etc. ) the shape of the spent coffee bed is a significant indicatorof the uniformityof flow during the drawdown.
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