石油小沙弥
:没接触过这个东西,不过查资料还是会的:
A thread in which the thread root lies on the minor cone of an external thread or lies on the major cone of an internal thread.
http://12.36.190.92/engineering/glossary/ViewItem.asp?id=396&db__start=392
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(2012-05-22 18:06)