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chắc vậy

Căn cứ vào Atlat Địa lí Việt Nam trang 18, phần lớn diện tích đất của vùng Bắc Trung Bộ là 

A. Đất lâm nghiệp có rừng. 

B. Đất phi nông nghiệp. 

C. Đất trồng cây công nghiệp lâu năm và cây ăn quả. 

D. Đất trồng cây lương thực, thực phẩm và cây hàng năm. 

bạn xem lại đề:

Có \(\frac{3}{2}\frac{3+7}{2+7}=\frac{10}{9}\)

Người ta thả một viên bi sắt có dạng hình cầu với bán kính nhỏ hơn 4,5cm vào một chiếc cốc hình trụ đang chứa nước thì viên bi sắt đó tiếp xúc với đáy cốc và tiếp xúc với mặt nước sau khi dâng (tham khảo hình vẽ bên). Biết rằng bán kính của phần trong đáy cốc bằng 5,4cm và chiều cao của mực nước ban đầu trong lòng cốc bằng 4,5cm. Bán kính của viên bi sắt đó bằng:

A. 4,2cm.

B. 3,6cm.

C. 2,6cm.

D. 2,7cm.

Gọi A là điểm biểu diễn của số phức z = 1 + 2 i  và B là điểm biểu diễn của số phức z ' = - 1 - 2 i  trên mặt phẳng tọa độ. Khẳng định nào sau đây là đúng?