harmonic expansion
(1)谐波展开式
(2)傅式级数展开式

• electrostatics electrostatic-type image tube
• electrostatio deflection system
• electrostatographic imaging process
• electrostatographic reproduction machine
• electrostriction
• electrostrictive
• electrosurgery
• electrotage
• electrotechnics
• electrotechniical
• electrothermography
• electrotimer
• electroytic recording paper
• electro-zoom lens
• electrstatic repulision
• elecyronic background suppression method
• elecyro-optical tracking system
• element
• elementary beam
• elementary hologram
• elementary meridianal beam
• elementary stimulus
• element factor
• element of matrix
• elements for photosensor arrays