Double shielding  双层屏蔽

double layer shielding  双层屏蔽

Double light shielding  双挡光片法

Double-layer shielding  双层屏蔽

double-layered shielding reversion point  双层屏蔽逆转点

double-wire gas shielded arc welding  双丝焊

double double iron  八叠板

“double-seat double-vote” system  双议席双票制

ball mill with double-inlet and double outlet  双进双出钢球磨煤机

cationic double-chamber double-layer float bed  阳双室双层浮动床

COAL PULVERIZER WITH DOUBLE INLET AND DOUBLE OUTLET  双进双出磨煤机

double blind double dummy  双盲双模拟

Double blind double dummy randomized controlled clinical trial  随机双盲双模拟对照试验

double bus bar with double sectionalized bus bars  双母线双分段接线

Double Busbar and Double Segment  双母线双分段

Double Chambers and Double Layers  双室双层

Double chambers double layers floating bed  双室双层浮动床

double column and double FID  双柱双检测器

Double columns and double FIDs  双柱双检测器

Double Connecting Rods and Double Crankshafts  双连杆双曲轴