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问题详情

在浇注板、粱和大型及中型截面的柱子时，混凝土拌合物的坍落度（mm）宜选用（）。

A、10~30

B、30~50

C、50~70

D、70~90

时间：2022-01-10 19:52 关键词：试验员(基础知识) 建筑八大员试验员

答案解析

B

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