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Nguyễn Thanh Vân
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2023-08-30 23:15:40
GHĐ là Giới hạn đo có nghĩa là độ dài lớn nhất trên thước
ĐCNN là Độ chia nhỏ nhất có nghĩa là độ dài giữa 2 vạch LIÊN TIẾP với nhau.