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大宗货物
生产与消费之间需要大批量运输的商品。以初级产品、原材料等为主,由铁路、水路和管道作为主要运输方式。
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spacecraft
spacecraft ablative thermal protection
spacecraft active attitude control system
spacecraft assemble plant
spacecraft assembly and integration
spacecraft astronomy
spacecraft attitude control
spacecraft attitude control actuator
spacecraft attitude control fly wheel
spacecraft attitude control system
spacecraft attitude determination
spacecraft attitude maneuvering
spacecraft autonomous control
spacecraft autonomous navigation system
spacecraft communication, telemetering, command and tracking system
spacecraft control system
spacecraft design
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spacecraft formation flight control
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