multiple-layer diskshutter
多层转盘式快门

• auroral cap
• auroral emission
• auroral light
• Auroral Line
• auroral photometer
• auroral region
• auroral spectrum
• auroral zone
• authentication
• authentic sample
• auto-alarm
• autoanalyzer
• autocap
• autocartograph
• autochrome
• autoclave
• autocoder
• autocollimatic spectroscope
• autocollimatiion
• auto-collimating
• autocollimating eyepiece
• autocollimating goniometer
• autocollimating measuring telescope
• Autocollimating Spectrograph
• autocollimating spectrometer