男性膀胱后方的器官有（）
A.精囊腺
B.前列腺
C. * * 球腺
D.输精管壶腹
E.直肠
参考答案：A, B, C, D, E
简述取心前井眼的准备工作？
Returned logistics is the goods flow（）
A. From sellers to buyers
B. From buyers to sellers
C. From outside to inside of any company
D. From wholesalers to retailers
