Conclusions Echocardiography can be used in diagnosis and approximate classification of TPVAD, in judgement of pulmonary venous drainage block and in prediction of the prognosis of patients.
结论应用超声心动图可确定该病的诊断和大致分型，判断肺静脉回流梗阻的有无及预后。
2
Petroleum exploration and development call for not only the intensive study and prediction of ground stresses but also simple, economical and practical approximate methods.
在油气的勘探与开发过程中既需要精细的地应力研究与预测，也需要简单易行、经济实用的近似方法。
3
Highway traffic noise prediction model is deduced and analyzed. It is indicated that the FHWA model originating from USA Federal Highway Administration is an approximate representation.