Objective discuss the clinical characteristics of senile heart failure.
目的探讨老年心力衰竭患者的临床特点。
As the service characteristics of the product itself, service failure is inevitable and widespread.
由于服务产品本身的特点，服务失误不可避免且大量存在。
As the service characteristics of the product itself, service failure is inevitable and widespread.
由于服务产品本身的特点，服务失误不可避免且大量存在。
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