阳性肾结石与胆石平片鉴别应摄（）
A.腹部仰卧前后位
B.腹部侧卧前后位
C.腹部站立前后位
D.腹部站立后前位
E.腹部侧位
参考答案：E
Allen followed his customer across the yard and stood on the step of the house, two shopping bags.
A．lifted
B．having lifted
C．to lift
D．lifting
产业集群的含义？
