Đun nóng dung dịch NaHCO₃ một thời gian thấy pH của dung dịch:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  witness                               delay                                 extreme                                improve

• Choose a word that has different stress pattern:

  family                          medical                        society                         natural

• Choose a word that has different stress pattern:

  program                           rename                        data                            homeless

• Choose a word that has different stress pattern:

  emergency                                vulnerable                           activity                            initiative

• Choose a word that has different stress pattern:

  establish                          endanger                       protection                         volunteer

• Choose the best answer for the following sentence:

  He was especially interested in such _____________ work, and had recently helped to organize the first Brazilian school for deaf-mutes at Rio de Janeiro.
  
  

• Choose the best answer for the following sentence:

  As a result of the influence of these gatherings, one ______________ reported at the last annual meeting that ten families in his community had bought and paid for homes.
  
  

• Choose the best answer for the following sentence:

  The ____________ called for a two-year moratorium on commercial whaling.
  
  

• Choose the best answer for the following sentence:

  Regular exercise has a direct ______________ on fitness and health.
   

• Choose the best answer for the following sentence:

  Looking up when he had copied it, Alban saw the doctor's eyes fixed on him with an oddly-mingled expression: partly of sympathy, partly of ________________.