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问题详情

国家标准规定,火山灰质硅酸盐水泥的终凝时间应________。

A、不迟于390分钟

B、不早于390分钟

C、不迟于600分钟

D、不早于600分钟

时间：2021-09-01 23:56 关键词：青书学堂东北林业大学土木工程材料土木工程专升本平时作业2

答案解析

A

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