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.
Under Stalin, the Communist Party of the Soviet Union adopted the theory of  socialism in one country and claimed that, due to the  aggravation of class struggle under socialism, it was possible, even necessary, to build socialism alone in one country, the USSR.lthough many forms of communism, such as Leninism, Trotskyism and Luxemburgism, are based on Marxism and Karl Marx is sometimes known as the father of Communism , non-Marxist versions of communism (such as Christian communism and anarchist communism) also exist.