由于对重复压裂井原有裂缝失效程度的难以评价，重复压裂井的产能预测常常有很大的误差。
Prediction results of productivity of refracturing Wells often has large error because the effectiveness failure of the previous fractures in refracturing Wells is difficult to evaluate.
由于重复压裂气井原有裂缝的失效程度难以评价，导致重复压裂气井的产能预测常常有很大的误差。
It is difficult to evaluate the failure extent of previous fractures in refractured gas Wells, which results in a big error in productivity prediction.
对在原有厂房内、复杂场地土上的机床基础的支护方案选择，大型机井的设计与施工，大体积混凝土温度裂缝的控制与计算进行的阐述。
The choice of plan with the foundation of equipment in complex soil, The count & control with the crevice for temperature of bib concrete are also discussed.
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