Report - 磁聚焦问题的探究 - USTCstaff.ustc.edu.cn/~bjye/em/student/2018/2-3.pdf · 2018/7/2 磁聚焦问题的探究石文焘指导教师：徐春凯一、长直螺线管 •1-1、理论推导

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