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【单选题】
关于套管头,有下列认识( )
A.
为安装防喷器和油层以下提供过渡连接的装置
B.
是用来悬挂技术套管和油层套管并密封各层套管间环形空间的装置
C.
套管头是在在下完技术套管或生产套管前安装
D.
套管头由本体、套管悬挂器和等组成
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