采用不同的粗细集料质量比例进行级配合成设计，并进行级配的优选。

Using different degree of aggregate ratio of quality level, and combined design of optimization.

youdao

采用不同的粗细集料质量比例进行级配合成设计，并进行级配的优选。

Using different degree of aggregate ratio of quality level, and combined design of optimization.

youdao