不存在门静脉系与腔静脉系之间的交通支的部位是
A．前腹壁B．直肠下部、肛管C．腹膜后D．胃底、食管下段E．脾门和胰体尾周围
参考答案：E
_____ the poem a second time, the meaning will become clearer to you.
A．Our having read
B．When you read
C．While reading
D．If reading
海洋石油专业设备指哪些？
