【单选题】
___主要作用是：悬挂井内管柱；与油管头一起形成密封后，构成油管内通径与上部采油树的通道和油管外与套管之间的环空通道。
A. 钻井四通
B. 油管头四通
C. 套管头
D. 油管挂
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答案
D
解析
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___安装在油管头以上由油管帽、手动平板阀、安全阀、三通或四通、节流阀、压力表等部件构成的井口管汇系统。（KQ78/65-70）
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油管头由油管头四通及阀门构成。下列对油管头四通说法正确的有___。
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【多选题】
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