... 大端带螺纹large end thread (LET) 两端带螺纹both end thread (BET) 一端带螺纹one end thread (OET) ...
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... 放气眼；通气眼vent hole 两头带罗纹both end thread(BET) 青灰酚醛份子化合物塑料grap你好te phenolic plastics ...
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... 大端带螺纹large end thread(LET) 两头带螺纹both end thread(BET) 一端带螺纹one end thread(OET) ...
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Thinking of each other is just like a thread connecting both you on the one end and me on the other end.
思念是一条细长的线，一端系着你，一端系着我，时刻连接着两颗跳动不息的心。
Both have the same pitch diameter at the top of the hole of internal threads or end of the pipe on external threads, and both have the same thread lengths or depths.
在内螺纹的孔的顶端或者外螺纹的管的端部拥有相同的中径，而且拥有相同的螺纹长度和深度。
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