And, if a robot arm were to swing out towards you, for safety reasons you would want to be able to immediately stop it and push it back without harming yourself, reverse that motion instantly. For one thing, that requires a back-driveable actuator.
（七）利用职务上的便利收受他人财物或者谋取其他利益的；，更多细节参见搜狗输入法下载
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