In the case of a truss bridge, a post-tensioned slab bridge, or a box girder bridge the sections are often floated to the bridge and then lifted into place by cranes on barges or cranes sitting over piers.
The very good reason why the word communism is so commonly associated with these revolutionary, anti-liberal, anti-democratic Marxists is that political parties with communist in the name were pretty much invariably of that bent throughout the 20th century, whereas parties called socialist or social democrat or labor varied enormously in ideology.
Communism is a way of running an economy and a government, in which the means of production (factories, equipment, the things which allow other things to be produced) are commonly owned, and which has no state, money, or social classes.n 1848, Karl Marx and Friedrich Engels wrote The Communist Manifesto. It was a short book with the basic ideas of communism. Most socialists and communists today still use this book to help them understand politics and economics. Many non-communists read it too, even if they do not agree with everything in it.