2021 National Question 5 Single-choice Differentiating 2021_新课标 II 卷 (2021) 5.正四棱台的上、下底面的边长分别为 2,4 ,侧棱长为 2 ,则其体积为( ) A. $20+12 \sqrt{3}$B. $28 \sqrt{2}$C. $\frac{56}{3}$D. $\frac{28 \sqrt{2}}{3}$ Answer keyD ☆ SaveCan't do it, show the explanation查看原卷 →