井身结构
参考答案:
包括:
(1)一口井的套管层次;
(2)各层套管的直径和下入深度;
(3)各层套管相应的钻头直径和钻进深度;
(4)各层套管外的水泥上返高度等等。
—Is Alice still performing?
—I'm afraid not. She is said _______ the stage already as she has become a director.
A.to have left
B.to leave
C.to have been left
D.to be left
膈肌腔静脉裂孔叙述错误的是()
A.位于食管裂孔的右前上方中心腱内
B.有胸导管通过
C.约在第8胸椎体水平
D.有下腔静脉通过
E.与主动脉裂孔约相差4个椎体高度