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

双层双跨  2-span and 2-storey

双层双跨混凝土框架  double-story and double-span RC frame

双层双跨平顶直墙  Double-storey; Double-span; flat roof; upright wall

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

双火层煤气发生炉  double fire layers coal gas generator

双火焰光度检测器  dual frame photometric detector; DFPD

双火焰区  two flame zones

柏树火焰层孔菌  Pyrofomes demidoffii

火焰层积法  flame deposition process

1/2斜纹面双层纬重织物  charmante stain

Cu-In双层膜  Cu-In double-layer films

D型内包层双包层光纤  D-shape inter clad fiber

GAC-石英砂双层滤池  granular active carbon-sand filter

Hadley环流双层结构  bi-level structure of Hadley cell

PS-PVA双层球  PS-PVA double layer microspheres

SQ3K型双层运输汽车专用车  SQ3K double-deck special car for transport of motor cars