watt-hour meter
瓦[特]小时计，电[度]表

• photobiology
• photobleaching
• photocamera
• photocarrier
• amplitude-modulated signal
• Amplitude Modulation
• amplitude object
• amplitude range
• amplitude spectrum
• amplitude splitting
• amplitude spread function
• amplitude stabilized laser
• amplitude transfer function
• amplitude transmittance
• amplitude vector
• Am-Pm conversion
• Am-Pm discriminator
• Ampnifier
• amshaft
• Amsler gridAmsler
• anaberration
• anaberrational telescope
• Anaglyph
• anaglyph printing
• anallatic lens