Engineering, 22.07.2021 09:30, neariah24

hãy giải thiích vì sao trong kết cấu thép thường sử dụng dầm thép có mặt cắt ngang chữ I, chữ C, chữ H mà không dùng dạng chữ nhật

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hãy giải thiích vì sao trong kết cấu thép thường sử dụng dầm thép có mặt cắt ngang chữ I, chữ C, chữ...