What is <type of electrification> of <direct current> ?
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What type of electrification is direct current?
SELECT DISTINCT ?a WHERE { ?a property:type_of_electrification resource:direct_current }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P930> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q159241>. }
select distinct ?answer where { ?answer wdt:P930 wd:Q159241}
42nd Street Shuttle Kaluzhsko-Rizhskaya Line Yerevan Metro Lyublinsko-Dmitrovskaya Line Kalininsko-Solntsevskaya line Bolshaya Koltsevaya Line Arbatsko-Pokrovskaya Line trams in Innsbruck Sokolnicheskaya line Serpukhovsko-Timiryazevskaya Line PKP class EU07 Metro SubwayLink Koltsevaya line PKP class ET40 Zamoskvoretskaya Line Filyovskaya Line Tagansko-Krasnopresnenskaya Line Line 2 Snaefell Mountain Railway Schöllenen railway Obolonsko–Teremkivska Line Sviatoshynsko-Brovarska Line Syretsko-Pecherska Line Hudson Line Kintetsu Ikoma Cable Line Line 4 Kintetsu Nishi-Shigi Cable Line Pujiang line Line 1