Based on the clue 'a centistere is this fraction of a stere a measure...', what is the answer?

Based on the clue 'a cellini masterpiece shows this greek hero holdin...', what is the answer? Based on the clue 'a center of egypts rice trade this nile delta city...', what is the answer? Based on the clue 'a center of tulip growing this dutch city gave its...', what is the answer? What is associated with: a centerpiece of the 1962 worlds fair this tower had science fiction art a german tv tower as… Based on the clue 'a central character without traditional attributes...', what is the answer? Based on the clue 'a central cohesive element or something inserted t...', what is the answer? Based on the clue 'a central computer that supports peripheral or sub...', what is the answer? Based on the clue 'a centrally controlled fleet of military vehicles ...', what is the answer?