求翻译：本工程位于辽宁省盘锦市，工程是一栋地上七层的住宅楼。建筑占地面积为4281㎡，层高为3m,建筑高度21.200 m。本楼为多层住宅，耐火等级为二级，设计使用年限为50年是什么意思？

The project is located in Panjin City, Liaoning Province, the project is a ground seven-storey residential building. The building covers an area of ​​4281 square meters, the height of 3m, the building height of 21.200 m. Floor storey residential, fire resistance rating of two design life of 50 years

This project is located in Liaoning Province, earth works is a modern 7 storey residential building. building footprint, and quality for 4281 m height is 3M, 21.200 m height. This building is multi-story homes, fire-rated for class 2, design life of 50 years

This project is located Liaoning Province Panjing, the project is ground seven apartment buildings.The construction area for 4281㎡, the building store height is 3m, construction highly 21.200 m.This building is the multi-layered housing, the fireproof rank is two levels, the design service life is 5

正在翻译，请等待...

正在翻译，请等待...