Một sóng âm có bước sóng 4 cm. Khoảng cách giữa hai điểm gần nhau nhất trên phương truyền âm dao động ngược pha là:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

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

  I / be/ wait/ here/ two hours.
  
  

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

  What/ you/ go/ post office/ yesterday/ for?
  
  

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

  What kind/ music/ you/ often/ listen/?
  
  

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

  Why/ you/ make/ a lot/ cakes/ now?
  
  

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

  He/ furious/ me/ refusal/ party/ last Sunday.
  
  

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

  Rain/ every day/ spend/ most/ time/ indoors.
  
  

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

  He/ show/ photograph/ hotel/ stay/ holiday.
  
  

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

  Opinion/ violent films/ not show/ television.
  
  

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

  If it hadn’t been so late, I would have called you.
  
  

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

  No one but the seven-year-old boy saw the accident.