题目

的平方根是( )A. 3 B. －3 C. ±3 D. 答案：【答案】D【解析】试题解析：∵，3的平方根是±， ∴实数的平方根是±，故选D.______ the prices of color TV sets down by 50%, the company had a very hard timeA.AsB.WithC.Because ofD.For