苛性碱溶液的膜化学清除法要求约每五天做一次。
Chemical cleaning of the membrane with caustic solution was required approximately once every 5 days.
着重讨论了膜化学清洗清洗剂的种类、化学清洗条件和清洗效果的评价方法。
The kind of chemical cleaning agents, cleaning condition and the evaluation methods of cleaning result are discusses.
随着树木的生长，它在树干上增加了一层吸收空气中的化学元素而生成的膜。
As the tree grows, it adds a layer to its trunk taking up chemical elements from the air.
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