超声测量胰体，常根据哪条血管定位（）
A.肠系膜上动脉
B.肠系膜上静脉
C.肺静脉
D.门静脉
E.下腔静脉
参考答案：A
The old man wants to see the great changes in our country, and I am sure he will ________.
A．in case
B．in charge
C．in time
D．in his turn
什么是移动梦网？如何使用“移动梦网”业务？
