antenna beam coverage
天线波束覆盖范围

• field glass
• field glasses
• field induced photomission
• field intensity
• field-ion microscope
• field-ion microscopy
• fieldistor
• field lens
• field lenses
• field mesh electrode
• field number
• field observation
• field of view
• field of vision
• field pattern
• field pick-up
• field piece
• field quantization
• field range
• field ray
• field repectition rate
• field repetition rate
• field scannign sensor
• field's discontinuity
• field stop