Features of aortic valve anomalies and pattern of changes of cardiac structure were the important consulting information for the selection of operation method.
瓣膜畸形类型及钙化程度、心内结构及功能改变情况是选择手术方法时的重要参考信息。
Conclusion: the cause of biliary fistula used to be incorrect selection of operation method, careless work in the operation and unreasonable postoperative management.
结论：胆瘘的原因多为手术方法选择不当、术中操作不仔细及术后处理失当。
Least square method of polynomial or the method based on the given function are used to fit pump characteristic curve in pump selection or operation.
在水泵的选型或运行中，通常采用多项式的最小二乘法或根据假设的函数关系来拟合水泵性能曲线。
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