| http://www.w3.org/ns/prov#value | - Afford common aviation business to society, including:extinguishing fire, touring, airphotoing, explording, goods posting, first-aid treating, advertising and flying sowing and so on.Others:SDA carries many kinds of business at the same time relying on air transport.On the base of doing well in air transport, SDA operates four-star class hotel(Crane Hotel), tour agency, industrial company, real es
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