Single open-ended and double open-ended coaxial
Dual-system and Double-wavelength Spectrophotometry
double-system double-wavelength fluorometry
boiler feed and open cleaning system
boiling-reflux-open-system
circulation of open system
close small set and open large-scale set
closed and open condition
combine open and hidden water intake
compact open and blow process
disequilibrium open system
Distributed Intelligent Open System