V-[type] thread
v形螺纹，三角[牙形]螺纹

• diagrammatic view
• diagraph
• dial depth gauge
• base unit of measurement
• BASIC
• basic filter
• basic frequency
• basic line of sight
• basic pulse generator
• basic roughness
• basic stimulus
• basis
• basis matrix
• batch
• batch sampling
• Bates wave-front shearing interferometer
• bath
• bathochromic shift
• bathometer
• bathymeter
• bathymetric map
• bathyphotometer
• batter level
• battery
• battery chamber