Số phức nào dưới đây là số thuần ảo ?           

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  optimist                  confident                     medical                   experience

• Choose a word that has different stress pattern:

  communicate                     expectancy                      disadvantage                    security

• Choose a word that has different stress pattern:

  standard                      design                      disease                  achieve

• Choose a word that has different stress pattern:

  conflicting                   atmosphere                   develop                       pollution 

• Choose the best answer for the following sentence:

  When I arrived late, my boss was very angry ___________ me.
  
  

• Choose the best answer for the following sentence:

  _____________ second thoughts, I’ll have the lentil soup after all.

• Choose the best answer for the following sentence:

  Very few passenger ships cross ___________ Atlantic these days.

• Choose the best answer for the following sentence:

  Last night we wanted to see ___________ film, so we went to ___________ cinema.
   

• Choose the best answer for the following sentence:

  Don’t worry ________ it; I promise it won’t be ____________ problem.
  
  

• Choose the best answer for the following sentence:

  By the end of the 21st century, scientists ___________ a cure for the common cold.