The first men to study the nature of electricity could not imagine that their experiments, carried on because of mere intellectual curiosity, would eventually lead to modern electrical technology, without which we can scarcely () contemporary life.

A. get hold of

B. conceive of

C. get the better of

D. take advantage of

当电流通过电极时，出现（）偏离于平衡值的现象，称为（）的极化。