“background material”的概念、定义、翻译、参考文献-科学参考

科学参考收录了1248194条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。

单词	background material
释义	background material 背景材料
随便看	precision optical system precision optics precision photo-electric potentiometer precision photometer detector precision positioning precision poteintiometer precision potentiometer precision prescribed precision presetting machine precision ratio precision reaming precision refractometer precision research audiometer precision resistance precision rolling precision rotary microtome precision rule precision saw precision sawing machine precision scale precision seamless steel tubes precision self-locking drill chuck precision-sleeve splicer precision small coaxal microwave connector precision spectrograph