单项选择题
下列抗战期间发生的战役，按时间顺序排列，正确的是（ ） ①平型关大捷 ②豫湘桂战役 ③长沙会战 ④南京保卫战
A. ②③①④B. ①④③②
C. ③②④①
D. ④②①③
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相关考题
For
each person in the treatment group, find the person in the control
group with the closest propensity score – this is how
treatment group members match. As shown in the figure, which
matching method does it indicate?
单项选择题
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