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钢筋混凝土结构当HRB335级钢筋时,婚嫁土强度等级不宜低于 ( )。

A、C15

B、C20

C、C30

D、C40

时间：2021-07-18 18:11 关键词：土木工程专升本高层建筑结构 2019级第三学期期末考试清考工程造价建筑结构 2020年第二学期期末考试

答案解析

B
B

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