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Cc c?p b?n d? l?p d?a. B?n d? l?p d?a c?p 1B?n d? l?p d?a c?p 2B?n d? l?p d?a c?p 3. . . . Phuong php di?u tra xy d?ng b?n d? l?p d?a c?p 1. Bao g?m cc bu?c sau:Bu?c 1: Cng tc chu?n b?Bu?c 2: i?u tra ngo?i nghi?pBu?c 3: Cng tc n?i nghi?p. Cng tc chu?n b?. Chu?n b? cc d?ng c? c?n
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