EHang Holdings Limited's eVTOL growth—certified aircraft, strong government backing, and diverse applications. Click for why ...
Abstract: An electric solar wind sail (E-sail) is a propellantless propulsion system that generates thrust in the interplanetary space by extracting momentum from the stream of solar wind ions by ...
Abstract: One of the functions of personalized learning is to provide learning resources/materials that match the needs and preferences of learner characteristics. The management of learner ...
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