10428| 19
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為什么工程師設(shè)計(jì)時(shí)熱衷于用內(nèi)六角螺釘,?它到底好在哪,? |
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點(diǎn)評(píng)
你是沒(méi)吃過(guò)一字螺絲銹住的苦,,工況惡劣就用外六角,一字的一旦銹了,,很難拆的
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