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我來湊興出個趣味題,這是以前我們得到美國訂單的一個圖紙 |
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點(diǎn)評
粗糙度分去除材料跟不去除材料兩種,前者是車、銑、磨、刨等工藝,后者是鑄造、熱軋、冷軋、鍛造等工藝,前者粗符號為三角,后者是小圓,這是常識...
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