混凝土配合比设计中几个问题的研究的翻译：Study of several problems in design of concrete mixture ratio 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

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Study of several problems in design of concrete mixture ratio

In proportioning of concrete design several question research

concrete mix design, in which several issues research

Study of several problems in design of concrete mixture ratio