如图所示螺纹的类型为http://netedu.xauat.edu.cn/mcourse/10/jxsj/WebContentEdit/UploadFile/201075121310255.gif
如图所示螺纹的类型为http://netedu.xauat.edu.cn/mcourse/10/jxsj/WebContentEdit/UploadFile/201075121310255.gif
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如图所示螺纹的类型为http://netedu.xauat.edu.cn/mcourse/10/jxsj/WebContentEdit/UploadFile/201075121310255.gif