
A.Ⅰ区为应力降低区,Ⅱ区为应力升高区,Ⅲ区为天然应力区 B.Ⅰ区为天然应力区,Ⅱ区为应力升高区,Ⅲ区为应力降低区 C.Ⅰ区为天然应力区,Ⅱ区为应力降低区,Ⅲ区为应力升高区 D.Ⅰ区为应力降低区,Ⅱ区为应力升高区,Ⅲ区为应力升高区正确答案A

A.Ⅰ区为应力降低区,Ⅱ区为应力升高区,Ⅲ区为天然应力区 B.Ⅰ区为天然应力区,Ⅱ区为应力升高区,Ⅲ区为应力降低区 C.Ⅰ区为天然应力区,Ⅱ区为应力降低区,Ⅲ区为应力升高区 D.Ⅰ区为应力降低区,Ⅱ区为应力升高区,Ⅲ区为应力升高区正确答案A