13.[数学[单选题]】-|||-把根式 sqrt [3]({(a-b))^2} 改写成分数指数幂的形式为 () 。-|||-A. ((a-b))^dfrac (2{3)}-|||-B. ((a-b))^dfrac (3{2)}-|||-C. ^dfrac (2{3)}-(b)^dfrac (2{3)}-|||-D. ^dfrac (3{2)}-(b)^dfrac (3{2)}