Cho tứ diện ABCD. Gọi I, J là trung điểm AD và BC. Giao tuyến của hai mặt phẳng (ADJ) và (BCI) (xem hình vẽ).

                                  

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  He had spent ______________ that he was broke.
   

• Choose the correct sentence which is built from the words and phrases given:

  he / twenty
   

• Choose a word that has different stress pattern:

  video               exactly                  carefully                  serious

• Choose a word that has different stress pattern:

  student                involve                  summer                   cottage

• Choose the best answer for the following sentence:

  It ______________ him that he had no idea of what was going on.
   

• Choose the best answer for the following sentence:

  She does not see her grandchildren very often so she makes ______________ real fuss of them when she does.
   

• Choose the best answer for the following sentence:

  She stood in the mucky yard and hands plunged into the pockets of her ____________ coat.
   

• Choose the best answer for the following sentence:

  Nowadays we ____________ how important television ______________for our knowledge about the world.
   

• Choose the best answer for the following sentence:

  You should help your children develop-their good habits and lose ______________.
   

• Choose a word that has different stress pattern:

  royal              talent               engrave              function