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砂率指的是（　）

单选题

2021-09-02 13:45

A、每立方米混凝土中砂的质量与混凝土总质量之比
B、每立方米混凝土中砂石的质量与混凝土总质量之比
C、每立方米混凝土中砂的质量和石子的质量之比
D、每立方米混凝土中砂的质量和砂石的总质量之比

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正确答案

D

试题解析

标签：国家开放大学建筑材料(A)

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