whole circle protractor
全圆分度器

• vertical missing
• vertical motion
• vertical parallax
• vertical plane
• vertical pressure
• vertical projection
• vertical resolution
• vertical-resolution wedge
• vertical section
• vertical strip camera
• vertical surface
• vertical transition
• vertical view
• vertiplane
• vertometer
• very-high-frequency
• very-high resolution spectroscopy
• vessel
• vestigial sideband
• V-groove cavity
• V-groove pulley
• V-guide way
• vial
• vial type level
• viameter