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美国路易士研究中心研制了一种精密划线装置。它安装在工具显微镜上,能在金属(或非金属)平面或圆曲面上精确地划出很细的线。该装置是为
The United States Louis research center developed a precision marking device. It is mounted on a tool microscope and can precisely draw thin lines on metal (or non-metal) or circular surfaces. The device is for