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ddhduygiang
2 năm trước
help me để hút hết nước ở 1 hồ lớn phải dùng 5 máy bơm, làm liên tục trong 18 h. Hỏi hút hết nước ở hồ đó trong 10h thì bổ sung thêm bn máy bơm
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