By convenient sampling, 105 stable COPD patients from three hospitals in Beijing were recruited in this study.
采取便利抽样的方法，对在北京市某三家三甲医院就诊的105例稳定期COPD患者进行问卷调查。
By convenient sampling, 30 CHB outpatients from a tertiary A-level hospital in Guangzhou were recruited into this study.
采用便利抽样法，调查了江西省樟树市人民医院的30例门诊治疗的慢性乙型肝炎患者。
The research object of the study is the domestic tourists, and we distribute questionnaires to the college student travelers on campus by convenient sampling.
本研究以国内旅游消费者为研究对象，通过便利抽样的方式对在校大学生旅游者发放问卷。
This paper introduces a method for FIR digital filter design. To compute and plot by using the frequency-sampling method and MATLAB makes the design of an FIR digital filter convenient.
介绍了FIR数字滤波器的设计，采用频率采样法，运用MATLAB完成设计中的计算和图形绘制，使其变得简单、快捷。
This paper introduces a method for FIR digital filter design. To compute and plot by using the frequency-sampling method and MATLAB makes the design of an FIR digital filter convenient.
介绍了FIR数字滤波器的设计，采用频率采样法，运用MATLAB完成设计中的计算和图形绘制，使其变得简单、快捷。
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