状态检测防火墙
state inspection firewall
stateful-inspection firewall
表面深度测量
Measurement of surface deepth
磁异常梯度测深
magnetic anomaly gradient depth sounding
钢表层硬化深度测定法
measuring case depth for steel
钢的表层硬化深度测定法
measuring case depth for steel
高精度深度记录仪
high-precision depth recorder
高精度速度-深度建模
high-precision depth-velocity estimation