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  • The theory is proved to be correct through a lot of experiment and spot tests . There are two parts in this paper.

    经过大量试验和现场测试证明这些理论是正确的。

    youdao

  • The theory is proved to be correct through a lot of experiment and spot tests . There are two parts in this paper.

    经过大量试验和现场测试证明这些理论是正确的。

    youdao

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