double curve turnout in the same direction  内方分岔

Circulate line selection in double direction  株系循环双向选优法

double curve turnout  双开道岔

double-in-double-out pulverizing mill  双进双出钢球磨煤机

generator working in double direction  电动机正反转

unsymmetrical double curve turnout  偏开道岔; 非对称双开道岔

a law of run in opposite direction  背驰定律

inter-transportation of freight in opposite direction  相向运输

Train running in opposite direction  反向行车

150kA pre-baked anode cell arranged in double rows and end by end  150kA纵向双列预焙铝电解槽

2wire double direction  二线双工

a fixed-point theorem in double cones  双锥上不动点定理

bolt in double shear  受双剪的螺栓

counting by double direction  双向计数

Cu-In double-layer films  Cu-In双层膜

Ditch sowing in double-ridge mulched with plastic film  全膜双垄沟播

doping in double emitting layer  双发光层掺杂

double - direction rinse  双向冲洗

double curve arch bridge  崇东双曲拱桥