The existing problem in operation of siphonal sand filter and innovation were introduced.
介绍了虹吸式砂滤器在运行过程中出现的问题及改造措
。
The existing problem in operation of siphonal sand filter and innovation were introduced.
介绍了虹吸式砂滤器在运行过程中出现的问题及改造措。
：以上例句、词
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