nephelometer
(1)蜀度计
(2)烟雾计
(3)能见度测定仪

• bearer
• bearing
• bearing angle
• bearing compass
• bearing point
• bearing tracking
• beat
• beat effect
• beat frequency
• beat frequency detector
• beat frequency interferometry
• beating
• beat setting
• beat spectrum
• beat wavelength
• beauty defect
• beauty defects
• beavertail
• bechstein photometer
• Beck apertometer
• becke apertometer
• Becke line
• Beckman spectrophotometer
• Becquerel
• Becquerel effect