... 转磁铁电流计 moving magnet galvonometer 动针式；转针式 moving needle type 活动目标指示器 moving target indicator; MTI ...
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moving-needle type galvanometer 可动磁针検流计
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A simple and feasible low-cost experimental system has been designed and made by using the lateral moving structure of the old-fashioned needle-type printer as the basic mechanic structure.
利用旧式针式打印机的横向走行结构，作为倒立摆的基本机械结构，设计并制作一种简单可行的低成本倒立摆实验系统。
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