astable multivibrator
(稳定)多谐振荡器

• Airy disc
• Airy Disk
• Airy disk radius
• Airy point
• Airy system
• Airy type objective
• aisle
• alabamine
• alarm
• alarm lamp
• Albada finder
• Albedo
• albedometer
• albedo radiation
• Al-clad
• alcohol
• aldehyde
• alexanderson altimeter
• Alexandrite
• algebraic complement
• algebraic expression
• algebra of matrices
• Algerithm
• algorithm
• algorithmic language