A.與試樣頂面成45度角 B.與試樣頂面成45+φ/2度角 C.與試樣頂面成45-φ/2度角
A.總應(yīng)力圓大 B.有效應(yīng)力圓大 C.兩個應(yīng)力圓一樣大
A.Ip>1 B.Ip=0 C.Ip<7