Vai trò của chọn lọc ổn định là:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:

  The wooden fence surrounded the factory is beginning to fall down because of the rain.  

• Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions:

    Foreign students who are doing a decision about which school to attend may not  know exactly where the choices are located.

• Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions: 

  Fertilizer, which is added to the soil to replace or increase plant nutrients, include animal and green manure, fish and bone meal and compost.

• Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:

  It is recommended that people to take regular exercise.    

• Dãy nào sau đây chỉ gồm các chất vừa tác dụng được với dung dịch HCl, vừa tác dụng được với dung dịch AgNO3 ?          

• Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:

  More than ten students have failed the exam, that surprised the class teacher.    

• Trường hợp không xảy ra phản ứng hoá học là:  

• Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:

  It was suggested that your father gave up smoking for the sake of himself.    

• Cho biết thứ tự từ trái sang phải của các cặp oxi hóa – khử trong dãy điện hóa (dãy thế điện cực chuẩn) như sau: Zn2+/Zn; Fe2+/Fe; Cu2+/ Cu; Fe3+/Fe2+; Ag+/Ag. Các kim loại và ion đều phản ứng được với ion Fe2+trong dung dịch là         

• Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:

  Air pollution, together with littering, are causing many problems in your large, industrial cities today.