About the normal constriction of the ureter, which of the following descriptions are correct?
A.Each ureter has three normal constriction. B.The first normal constriction is at the the junction between the renal pelvis and the ureter. C.The second normal constriction is at the brim of the lesser pelvis. D.The third normal constriction is at the place where the ureter passes through the bladder wall. E.The stone of ureter is easily lodged in these three normal constrictions.正确答案ABCDE
