diameter feedback control
径向反馈控制

• extinction
• extinction angle
• extinction coefficeint
• extinction coefficient
• extinction meter
• extinction radtio
• extinction ratio
• extinction test
• extinction voltage
• extinquishing filter
• extra-axial imagery
• extra-axial object point
• extra-axial point
• extra band
• extra central telescope
• extraction
• extraction ability
• extra=dense barium crown
• extra dense flient
• extra excitation
• extra-fine fit
• extra-fine thread
• extrafocal image
• extrafocal photometry
• extragalactic object