2020-2021学年仁爱版英语九年级下册词汇讲义拓展学习法（第135组)

词汇讲义拓展学习法 第135组 footstep 1)  footstep [英]['fʊtstep]  [美]['fut'stɛp]  托杯(粗纱机锭子支承用) 2)  footstep [英]['fʊtstep]  [美]['fut'stɛp]  n.脚步(声),足迹 3)  footstep of the skewer  木锭子托杯 4)  footstep installation  台阶安装 5)  footstep retainer  台阶挡板 6)  slippery footstep  球面滑履 1. Research and practice of big lead angle rotating unloading method for precise cold extrusion die of spherical slippery footstep 球面滑履精密冷挤压大升角旋转脱模方法研究与实践 2. In this paper,spherical slippery footstep parts in order to achieve precision of 18μm in mass forming production,it is a high precision forming,in the subject it making use of near-net forming technology,the integrated use of precision die technology,computer technology,automation technology,numerical analysis and simulation technology to ensure forming parts precision. 本文研究球面滑履零件成形要实现精度在18μm的批量生产,属于高精密成形,在本课题中运用近(?)成形技术,即综合运用精密模具技术、计算机技术、自动化技术、数值分析和模拟技术来保证成形件精度要求。 3. smooth-earth diffraction theory  光滑地球表面衍射理论 4. track Ball  轨迹球,[港]滑球 5. having caterpillar treads on the re