题目：
混凝土用碎石的强度用什么指标控制？
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B解析：毛细血管脆性增加见于：①毛细血管壁异常：如过敏性紫癜；②血小板量与质异常；③血管性血友病等。
混凝土用碎石的强度用什么指标控制？
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