direct vision spectroscope
直视分光镜

• Q-switching laser
• Q-switching technique
• Q-switch laser
• Q-switch ruby laser
• quadaratic surface
• quadrangle
• quadrant
• quadrantal heterodyne array
• quadrant angle of revolution
• quadrasonics
• quadrate
• light freqency
• light frequecny modulation
• light gate
• light-gathering power
• light gating
• light generation
• light-gtahering potics
• light halo
• light homer
• light homing guidane
• light image converter
• light-indcued modulation
• lighting
• lighting apparatus