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.
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В Москве прошла самая снежная зима14:52，更多细节参见Feiyi
Трамп допустил ужесточение торговых соглашений с другими странами20:46，更多细节参见旺商聊官方下载