objective with variable focal length
可变焦距物镜

• plutonium
• PLZT display device
• PLZT wafers
• PME-effect
• multilevel laser
• multilevel system
• multiline
• multilobed beadm
• multilongitudianl-mode laser
• multimedium
• multimeter
• multimode
• multimode cavity
• multimode cavity oscillation
• multimode fiber transmission
• multimode laser
• multimode laser emission
• multimode optical fibre
• multimode oscillation
• multimode step-index fibre
• multinomial
• multiorbit flight
• multipactor effect
• multipass
• multipass Fabry-Perot spectroscopy