Chọn sản phẩm chính cho phản ứng sau: C₂H₅COOCH₃   A + B. A, B là:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  Either spring_________ summer is a good time to visit our region.

   

• Choose the best answer for the following sentence:

  The woman ______________ I told you works in our school.
  
  

• Choose the best answer for the following sentence:

  Pam is the friend ________ she lives.
  
  

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

  Fiona has a beautiful voice and plays the guitar very well. 

• Choose the best answer for the following sentence:

  The house __________ I live is very small.

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

  hair /Jimmy / has / hair / but / Johnny’s / dark / is / fair / got

   

   

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

  much / enjoy / football / they / hockey / very / playing / and

   

   

• Choose a word that has different stress pattern:

  lazy            confess                friendship                  soccer

• Choose a word that has different stress pattern:

  confide               matter                finish                even

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

  cheat            psychology              each                approach