Aiming at these problems, conventional hydraulic fracture and chemical plug removal havebeen applied in field, but it can't solve the short valid period radically although some effects have beenmade.
针对以上问题，油田上尽管采取了普通的水力压裂、化学解堵等增注措施，并取得了一定的效果，但还是没有从根本上解决有效期短的问题。
参考来源 - 注聚井解堵增注技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Robert: How long is the valid period of "certificate of registration"?
罗伯特：《登记证》的有效期有多长？
The valid period of the labor contract shall be fixed by the employer-unit and the employee through consultation.
劳动合同期限由用人单位和劳动者协商确定。
The CIRC shall make a decision on whether to approve the extension or not before the valid period of the insurance license expires.
中国保监会应当在许可证有效期届满前作出是否准予延续的决定。
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