题目内容：
公路桥涵构件安装时的混凝土强度，当设计无具体要求时，不应小于混凝土设计强度标准值的（ ）。
参考答案：
答案解析：
单选题：公路桥涵构件安装时的混凝土强度，当设计无具体要求时，不应小于混凝土设计强度标准值的（ ）。
- 题目分类：公路造价技术与计量
- 题目类型：单选题
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