在正方体ABCD﹣A1B1C1D1中，点E为底面ABCD上的动点．若三棱锥B﹣D1EC的表面积最大，则E点位于

题干

在正方体ABCD﹣A₁B₁C₁D₁中，点E为底面ABCD上的动点．若三棱锥B﹣D₁EC的表面积最大，则E点位于（　　）

A：点A处

B：线段AD的中点处

C：线段AB的中点处

D：点D处

上一题下一题 0.0难度选择题更新时间:2019-11-11 10:56:36

A

What Project Hope has done in a province in 2006
Money Project Hope has raised	28,593,346 yuan
Students it has helped	5036
Schools it has built	62
Books it has bought	3,452,141
Clothes it has given	5,000
People who have taken part	367,403

Project Hope

Project Hope has done many things in China. It has raised much money —28,593,346 yuan.