quafdrture
(1)90相移
(2)正交
(3)求积分，求面积

• natural logarithm
• natural oscillation
• natural quartz
• natural scene illuminance
• natural source
• natural vibration
• natural wave
• natural width
• nature
• nature resonance
• nautical mile
• navar
• nave
• navigation
• navigational star
• self-luminous
• self-luminous body
• self-luminous colo(u)r
• self-luminous object
• self-mode-locked atmospheric CO2 laser
• self-mode-locking
• self-modulation
• selfoc
• selfoc dielectric waveguide
• selfoc fibre