题目内容

Display of fruit, vegetables and flowers just inside a store are common. They give customer a feeling of healthy living before they reach the other ordinary items.

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There is always fruit,vegetables and flowers just inside a store. （）

Big brand names and items like precooked meals are very profitable, so they are often clearly displayed to get the customer’s attention.

（）一般是指利用膜对流体混合物中不同组分的选择性渗透的特点来分离流体混合物的操作过程

根据所采用的过滤介质的不同,可将过滤分为以下四类,格筛过滤,微孔过滤,膜过滤和（）