60 长度仪器(Length Instruments) 对一维长度量进行测量的仪器，如激光干涉仪，高度测量仪器，量块比较 仪，指示表检查仪等。
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length measuring instruments 长度测量器具
Optical length measuring instruments 光学长度计量仪器
Standard Length Laparoscopic Instruments 标准腹腔镜器械
Pediatric Length Laparoscopic Instruments 儿童腹腔镜器械
Bariatric Length Laparoscopic Instruments 肥胖病人腹腔镜器械
INSTRUMENTS FOR MEASURING LENGTH 长度量具
·2,447,543篇论文数据，部分数据来源于NoteExpress
Determining the length of the galaxy took years of research from the astronomers, and combined observations from a number of different instruments.
FORBES: Astronomers Find The Largest Known Spiral Galaxy
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