plumb bob
美 [plʌm bɑːb]英 [plʌm bɒb]
- 铅锤；垂球
plumb bob-
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。
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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。