卜婷

这个人很懒,什么都没写

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  • 分类:军事 格式:PDF 积分:0 上传者:卜婷 上传时间:2018-01-25

    摘要:A perforating gun is designed to have explosive charges spirally disposed around its circumference in accord...

  • 分类:军事 格式:PDF 积分:0 上传者:卜婷 上传时间:2018-01-25

    摘要:A pipeline pig having improved means of sensing changes in the internal configuration of the pipeline throug...

  • 分类:军事 格式:PDF 积分:0 上传者:卜婷 上传时间:2018-01-25

    摘要:Prefabricated building panels and methods for their manufacture is provided wherein the panels comprise a fr...

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