... 选择输入 selection input 选择数据 selecting data 选择数字发送器 selective digit emitter ...
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选择数据定义视图中的项目文件夹。
选择数据集的默认目录并选择Next。
Select the default directory for the data sets, and select Next.
本教程中,您将让用户能够选择数据使用何种服务。
In this tutorial, you are going to enable the user to choose what service to use for the data.
Well, a cross-sectional study would mean that you'd get a random group of the population and measure them in 1970 and then take another random group five years later and measure them, but it wouldn't be the same people necessarily, it would be different groups of people.
那么,横断面研究就是,1970年你在人群中随意选择一组人,并记录下相关数据,然后,五年后再随意选择一组人记录数据,但这不需要是同一组人,通常是不同的人
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