5322| 8
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六角頭螺栓中六角頭的15~30°斜角是怎么制造的 |
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點(diǎn)評(píng)
正解,,樓主可參閱懂水魚推薦的約瑟夫.迪林格《機(jī)械制造工程基礎(chǔ)》101頁(yè),,就是那內(nèi)六角螺釘舉例的
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