gas ballast rotary pump
气镇旋转泵

• multielement lens
• multielement optical system
• multi elliptical-cryindrical cavity
• multifibre
• multifilament lamp
• multiflash
• multifocal
• multifocal lens
• multifocal spectacles
• multifocus viewfinder
• multifrequency operation
• multifunctional
• multi-function products
• multigrid
• multihead amplifier
• multijunction
• multilarer blockiing filter
• multi-lateral
• multilayer
• multilayer dielectric coating
• multilayer dielectric film
• multilayer dielectric reflector
• multilayer film
• multilayer filter
• multilayer glass