混凝土强度等级为C30~C60及有抗冻、抗渗要求的宜用( )级粗集料 -题库考试答案搜索网

混凝土强度等级为C30~C60及有抗冻、抗渗要求的宜用( )级粗集料

单选题

2021-07-17 23:31

A、Ⅰ级;
B、Ⅱ 级;
C、Ⅲ 级

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正确答案

B

试题解析

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