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Physics, 25.10.2021 14:00 mayamcmillan11

một mẫu thử có đường kính d=20mm chiều dài thử l0=200mm chịu một lực kéo p=45mn độ dãn dài đàn hồi đo được l=200,017mm hãy tính modun đàn hồi khi kéo E

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một mẫu thử có đường kính d=20mm chiều dài thử l0=200mm chịu một lực kéo p=45mn độ dãn dài đàn hồi đ...

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