双层竖向重叠隧道
Double-layer vertical overlapping tunnel
单面涂层双层纸板
one-side coated duplex board
生铀层双层结构
Uranium-bearing double—layer structure
双层道面
double-layer concrete pavement
双层双跨混凝土框架
double-story and double-span RC frame
双层双曲抛物面网格壳
hyperbolic parabolic double-deck reticulated shall
双层双扇形
double-layer twin fans shaping
双隧道结
Double tunneling junctions
双隧道重建
Double tunnels reconstruction
第2层隧道协议
Layer 2 Tunneling Protocol
aquatic humic substance
第2层隧道协议接入集中体系
layer 2 tunneling protocol access aggregation