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Một cái phễu rỗng phần trên có kích thước như hình vẽ. Diện tích xung quanh của phễu là:         

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Find a mistake in the four underlined parts of the sentence and correct it:

  If I find your pen. I send it to you.

• Find a mistake in the four underlined parts of the sentence and correct it:

  I am very interesting in problems caused by pollution.

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

  comic                  cotton                     post                      economic

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

  health                    think                       toothache                       other

• Choose the word whose stress is on the second syllable:

  important                 politics                    supervise                     concentrate 

• Choose the word whose stress is on the second syllable:

  coffee                    brother                     commune                       express

• Choose the word whose stress is on the second syllable:

  capture                     speedy                   discuss                        spacious

• Choose the best answer for the following sentence:

  Don’t forget to ____________ in touch while you’re away.

• Find a mistake in the four underlined parts of the sentence and correct it:

  We study hard in high school in order to entrance a good university.

• Find a mistake in the four underlined parts of the sentence and correct it:

  The Europeans and Asians are completely different with each other.