concrete grade

例句：

1. 1.The concrete grade of the foundation is crucial for the stability of the building.
   地基的混凝土等级对建筑的稳定性至关重要。
2. 2. The engineers carefully selected the appropriate concrete grade to ensure the durability of the structure.
   工程师们仔细选择了适当的混凝土等级，以确保结构的耐用性。
3. 3.The construction company has to comply with the local regulations regarding the concrete grade used in the project.
   施工公司必须遵守当地法规，关于项目使用的混凝土等级。