安评级别
Level of evaluation of seismic safety
安全级别
security level
safety level
Classified criteria for security
safety classifi cation
safety grade
保护级别和措施
Protection level and measures
北美表示级别协议语法
NAPLPS North American Presentation Level Protocol Syntax
不同抽象级别电路信息
circuit information at different abstraction levels
层序划分级别
rank of continental sequence