本发明地面操作安全，细微裂隙地层堵水效果好。

The chemical grouting material has safe surface operation, and has good water plugging effect on stratums with micro cracks.

youdao

本发明地面操作安全，细微裂隙地层堵水效果好。

The chemical grouting material has safe surface operation, and has good water plugging effect on stratums with micro cracks.

youdao