mso-ascii-theme-font:minor-latin;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Times New Roman mso-bidi-theme-font:minor-bidi;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA">下面几种叙述中，哪一种是正确的？

【单选题】【消耗次数：1】

① 所有螺纹只需标出相应标准所规定的螺纹代号

② 所有螺纹的公称直径前面必须加上“M”符号

③ 牙型、大径及螺距都符合标准，但极限偏差不符合标准的螺纹，除应注明代号外，还应注出极限尺寸

④ 只要牙型、公称直径、螺距三者都一致，一对内外螺纹才能旋合

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