Conclusion Combination use of two drugs can decrease pre load and post load of heart, increase cardial minute ouput, improve the heart function.
结论两种药物联用降低心脏前负荷、后负荷，增加心脏每分输出量，改善心肺功能。
2
Present a time-varying parametric model that is LPTV type, and study the relationship between model parametrics and cyclostatistics of its ouput signal. ?
给出了循环平稳随机信号的LPTV时变参数信号模型及该模型参数与信号循环统计量之间的关系。
3
This paper calculates, analyses and determines the pressure point of maximum of ouput power and saving-energy efficiency of differential pressure and Limited pressure variable displacement pump.