guide number letter scale
曝光指数等级

• monopole spectrometer
• monopulse
• monoscoep tube
• monoscope
• monoscope cathode-ray tube
• monoscope character generator
• monostable
• monostable display
• monostable flip-flop
• monostable multivibrator
• monostatic heterodyne system
• monotone
• monotonically decreasing function
• monotony
• monovalent
• monovalent ion
• monoxide
• montage
• moon
• moon-beased laser communication system
• Mooney rhomb
• moonlight
• moon-shaped lens
• mopopulse optical radar
• moring-magnet instrument