如图, 在三棱锥 D﹣ ABC 中, G 是△ABC 的重心, E, F 分别在 BC, CD 上,且BE=1/2EC,DF=1/2FC(1) 证明: 平面 G

如图, 在三棱锥 D﹣ ABC 中, G 是△ABC 的重心, E, F 分别在 BC, CD 上,且BE=1/2EC,DF=1/2FC(1) 证明: 平面 GEF∥平面 ABD;(2) 若 CD⊥平

查看答案

Vivian will take her daughter to the amusement park________she gets the tickets.

Vivian will take her daughter to the amusement park________she gets the tickets.

查看答案

Check what you have written _______ you hand in your application form.

Check what you have written _______ you hand in your application form.

查看答案

______ you keep moving, youll never reach the top of the mountain.

______ you keep moving, youll never reach the top of the mountain.

查看答案

Miss Zhang is _____ English teacher. She has taught in our school for ten years.

Miss Zhang is _____ English teacher. She has taught in our school for ten years.

查看答案