标题（Title） 一般不超过80个字符
American Concrete Institute
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关键词（KeyWords）一般不超过100个字符
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描述（Description）一般不超过200个字符
The American Concrete Institute (ACI) is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical resources, educational programs, certification programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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