Tao đã confirm với Qualipro, họ giải thích rằng trong mẫu test cát bị lẫn tạp chất: đất sét, đá nhỏ...do vậy làm kết quả bị tăng lên. Tao đã đồng ý và các mẫu test sau này yêu cầu mẫu phải sạch
I did confirm with Qualipro, they explained that in model test of sand were impurities: clay, small rocks ... and so do the results were increased. I agree and the sample test after this request form should be clean
I did confirm with Qualipro, they explain that the test sample was adulterated sand: clay, small stones ... so as a result is increased. I agreed and later test samples must request form clean