【判断题】
带压作业在起下油管过程中，如上部卡瓦不能有效卡固油管时，就使用下部卡瓦和防喷器。
A. 对
B. 错
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答案
B
解析
暂无解析
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【单选题】
油管头的作用___。
A. 将外部的各层套管与油层套管连接起来，并使管外环空严密不漏
B. 控制和调节油气井自喷、机采
C. 录取油、套压资料和测压、清蜡等日常生产管理
D. 吊挂油管、密封油管与油层套管之间的环形空间
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