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. Cassandra is still not convinced and asks Heidi to explain what makes communism different. Heidi explains that communism is a social and economic philosophy that is based on the elimination of all private property ownership to create complete equality. Karl Marx and Friedrich Engels provide the most common explanation of communism in their 1848 book, The Communist Manifesto.