yichundahuasheng

yichundahuasheng

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  • Videos
  • Throwing cement blocks with holes around the edges into the ocean can significantly improve the mari
    0:46

    Throwing cement blocks with holes around the edges into the ocean can significantly improve the mari

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  • Why are there so many irregularly shaped rocks piled up on the seaside breakwater?
    0:48

    Why are there so many irregularly shaped rocks piled up on the seaside breakwater?

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  • Principles of Directional Demolition Blasting
    0:56

    Principles of Directional Demolition Blasting

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