high-quality primary mirror
优质主镜

• Nuqiost staboout croteropm nut
• nutation
• nutation frequency
• nut collar
• nutron image intensifier
• nuvistor
• nvariable plane
• nverted Vee way
• NW-quadrant
• nyctalopia
• nyctometer
• nylon
• Nyquist criterion
• Nyquist method
• Nyquist noise
• Nyquist sampling interval
• nystagmograph
• Nystagmus tape
• oak
• object
• object angle
• object beam
• object depth
• object distance
• object field