Thiếu Fe thì cây bị vàng lá. Nguyên nhân chính là do Fe là thành phần cấu trúc của:

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Một số câu hỏi khác có thể bạn quan tâm.

• Cho bảng số liệu sau:
  
  Đàn bò và đàn lợn trên thế giới, thời kì 1980 - 2002 ( triệu con).
  Chọn đáp án đúng: Số lượng bò giai đoạn 1980 -1992 tăng bao nhiêu :
  
• Sản xuất của cải vật chất giữ vai trò là
  
• Nhà Đông Hán đã cử ai lãnh đạo quân xâm lược nước ta năm 40 :
  

• If there were no subjunctive mood, English _______ much easier.

• Read the passage and choose the correct answer:
  Previously on the ground of the present structure was Norodom Palace built in 1868 as a residence of the French- Governor General of Cochinchina. On September 7, 1954 Norodom Palace was renamed the Independence Palace and became the Presidential Palace in which President Ngo Dinh Diem of the Sai Gon administration and his family lived and worked. In February 1962, a dissident of the Diem regime launched an air bombardment of the palace and heavily damaged it. After that, Diem decided to demolish the damaged structure and built a new one which was designed by Western-trained architect Ngo Viet Thu. The construction. was undertaken by Sai Gon sappers and completed in 1966. At 11:30 on April 30, 1975, tanks of the Liberation Army over-rim the palace. The then Sal Con president, Mr. Duong Van Minh, who had just assumed the post of president together with his 45-member cabinet surrendered unconditionally. After the liberation of Sai Gon, the Independence Palace was turned into the Headquarters of Municipal Military Administrative Committee. In December 1975, the palace was the venue of a consultative conference for national reunification. To mark the historical significance of that event, the building was renamed Reunification Conference Hall.
  Question. According to the passage, . . . . . . . . . . . . . . . . . . . . .
  

• ______ the students in my class enjoy taking part in social activities.

• Nghiệm của phương trình là:         

• She is a kind of woman who does not care much of work but generally _______ only with colleagues for meals, movies or late nights at a club.

• Mật độ dân số trung bình của Liên bang Nga vào năm 2005 là
  
• Để thực hiện tốt quy luật lượng – chất, cần tránh tư tưởng nào dưới đây?