vertical leveling mirror
垂直调平镜

• radioactive counter
• radioactive decay
• radioactive detector
• radioactive half-life
• radioactive isotope
• radioactive luminescent paint
• radioactive metal
• radioactive source
• radioactive tracer
• radioactivity
• radio astronomy
• radioautogram
• radioautograph
• radioautography
• radio brightness
• radiochromatogram
• radiochromatograph
• radiochromatography
• radiochrometer
• radiocrystallography
• radio dish
• radioelectronics
• radio-frequency
• radio-frequency beat
• radio-frequency coupling technique