北方严寒地区高速公路混凝土的盐冻破坏是一个重要课题。

In North cold areas, the SaltFreezing destroy of Roadway concrete is a very important problem.

youdao

北方严寒地区高速公路混凝土的盐冻破坏是一个重要课题。

In North cold areas, the SaltFreezing destroy of Roadway concrete is a very important problem.

youdao