plumb bob

英 [plʌm bɒb]

美 [plʌm bɑːb]

铅锤；垂球

机械

英英释义

noun

• the metal bob of a plumb line
  Synonym:plumbplummet

双语例句

• If the mass in question is a plumb bob, the horizontal component of F is important.
  如果所讨论的质量是一摆锤，则重要的是F的水平分量。
• Due to its huge height, its urgent time schedule and strict requirement of fine quality, its construction has been duly guided and controlled by application of the JD-91 type laser-heavy plumb bob surveying apparatus with a double controlled axial line extended technology.
  由于楼层高、工期紧，为确保主体结构工程质量，垂直度控制采用激光&重锤双控轴线引伸技术，使用JD-91型建设激光测量仪。