防砂完井技术通常有（）和（）完井。
参考答案：割缝衬管完井；砾石充填
么叫绝对渗透率？
-----It seems a little ugly to me .
-----______, I think it’s rather beautiful.
A．In other words
B．On the other hand
C．On the contrary
D．In a nutshell
