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 thus a form of socialismâa higher and more advanced form, according to its advocates. Exactly how communism differs from socialism has long been a matter of debate, but the distinction rests largely on the communistsâ adherence to the revolutionary socialism of Karl Marx.