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inside screw and non-rising stem

英 [ˌɪnˈsaɪd skruː ənd ˈnəʊn ˈraɪzɪŋ stem] 美 [ˌɪnˈsaɪd skruː ənd ˈnoʊn ˈraɪzɪŋ stem]

暗杆内螺纹

化学

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