Trong khí quyển Trái Đất, tầng có tác dụng phản hồi sóng vô tuyến từ mặt đất truyền lên là: 

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  This box ___________ for a long time yet.
  
  

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

  John Lennon / gain / worldwide / fame / one / the founding members / The Beatles //.
  
  

• Choose one sentence that has the same meaning as the root one:

  She has just made this dress.
  
  

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

   He / murder / one month later / New York City / 8 December 1980.
  
  

• Choose one sentence that has the same meaning as the root one:

  The traffic jam prevented me from going to work.
  
  

• Choose one sentence that has the same meaning as the root one:

  When they arrived, the bus had left.
  
  

• Choose the word that has the underlined part pronounced differently from the rest:  

  remote                     control                      connect                      personal   

• Choose the word that has the underlined part pronounced differently from the rest:  

  put                       full                   June               pull

• Choose a word that has different stress pattern:

  software                   hardware                    magic               machine

• Choose a word that has different stress pattern:

  daily                receive                almost                 scenic