There were also manuals on terrorism, urban guerilla warfare and how to make explosives at home using a 3D printer, as well as white supremacist literature and a pistol holster with the symbol of the German army during the Second World II The first such factory to be discovered in Spain als...
32. How does 3D printing work according to Paragraph 1?A. It follows orders from computer models.B. It combines layers of material to make a shape.C. It uses three-dimensional objects to make computer models.D. It needs to be connected with a special printer.33. What's the author's ...
2 Gun-making in Gardone--the Craft System.Jaikumar, Ramchandran
The compass(指南针),gun-powder, papermaking, and print-ing(印刷术) are the four greatinventions of ancient China.The CompassThe earliest compass appeared in the4th century BC. Then during the SongDynasty people used this magnetic(有磁性的)device to show the direction of south.They used an ...
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4great inventions--computer,gun powder,paper--making and printing were made by China in ancient time
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These mills are all known to have been collected from the gun trade in the West Midlands in the post war period. The mill in the private collection has recently been shown to be dated June 1813. This mill is therefore one of the earliest known special purpose milling machines and is ...