safety class structure

基本解释

The safety class of building structure of this project is II and the design working life is 50 years.
本工程建筑结构安全等级为二级，设计使用年限为50年。
Computation results show that reliability index of gate component strengths conforms with safety standards of the first class structure.
计算结果表明，闸门构件强度可靠指标基本满足一级建筑物安全水准。
The basic principle, usage of air blowing based level detection, and the structure and application of UCA(H) type nuclear safety class air blowing device are described briefly.
简述吹气法检测液位的基本原理、用途以及UCA（H）系列核安全级吹气装置的结构和应用。