rotating double-sphere dumbbell-type viscometer 旋转双球哑铃式粘度计

double chambered sphere 双室球形潜水舱

double layer sphere 双层球

double-integrating-sphere 双积分球

double integrating sphere 双积分球技术

absorbing double-layer sphere 吸收双层球

Double-integrating-sphere system 双积分球系统

double-lock twin-sphere 双口球形舱

a double integrating sphere system 双积分球系统