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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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Как отмечается, авиакатастрофа произошла в городе Эль-Альто недалеко от местного аэропорта. В результате ЧП из салона вывалились сотни тысяч купюр боливиано (местная валюта). Очевидцы бросились собирать деньги с земли.