Cast-in-situ concrete hollow floor structure has been widely used all over the country.

现浇混凝土空心楼盖结构在我国已得到广泛应用。

youdao

Cast-in-situ concrete hollow floor structure has been widely used all over the country.

现浇混凝土空心楼盖结构在我国已得到广泛应用。

youdao