About: http://webisa.webdatacommons.org/132206782

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	When studying a cycle of the movement of the moving part, i.e. a forward motion and a backward motion of the piston 3, the operation of the alternator can be divided into four periods, respectively represented in FIGS. 1a-1d.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com