annular coupling mirror
环状耦合反射镜

• feed arrangement
• feedback
• feedback amlifier
• feedback circuit
• feedback compensation
• feedback-controlled optics
• feedback control system
• feedback ratio
• feeder
• feed spool
• feedthrough
• feedway
• feeler
• feeler lever
• feeler microscope
• feeler plug
• feet
• feldspar
• felt polisher
• felt ring
• felt-ring seal
• felt seal
• felt washer
• female thread
• femto