机械校准件
And he had all the users bring their kits in annually for overhaul and calibration.
FORBES: Six Decades in the Utility Business With Doble Engineering: A Seasoned Veteran Looks Back
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。