当供求均衡时的需求价格弹性。
参考答案：
The meeting ____ last night was a great success and all the disagreements got ____. [ ]
A. to be held; settled
B. held; settled
C. holding; settling
D. being held; settled
肛门部手术可引起尿潴留的是：（）
A.提肛肌
B.肛管直肠环
C.外括约肌
D.内括约肌
E.膀胱颈部肌肉
