Cho tứ diện OABC có OA, OB, OC đôi một vuông góc với nhau. Kẻ OH vuông góc với mặt phẳng (ABC) tại H. Khẳng định nào sau đây là khẳng định sai?  

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

   reject                precede               feature                polite

• Choose the best answer for the following sentence:

  My new friend is a law student and he _________ for three years now.
  
  

• Choose the best answer for the following sentence:

  I wasn’t thirsty because I __________ some milk.
  
  

• Choose the best answer for the following sentence:

  Look! That man _________ your bicycle!
  
  
  

• Choose the best answer for the following sentence:

  We’ll give the message as soon as he ______________. 

• Choose the best answer for the following sentence:

  This time next week Mike ___________ for me at the station.
  
  

• Choose the best answer for the following sentence:

  I knew you ___________ because your hair was covered with paint.
  
  

• Choose the best answer for the following sentence:

  He looked __________ when he heard the news.
  
  

• Choose the best answer for the following sentence:

  I think John is ___________ in love with a Japanese girl.
  
  

• Choose the best answer for the following sentence:

  In the past, the parents of the bride and the groom __________ on the marriage.