18407| 36
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工程圖面中的表面粗糙度標(biāo)注要點(diǎn) |
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點(diǎn)評(píng)
以前都沒(méi)怎么注意,現(xiàn)在想想還是很有道理的 (粗糙度尖頭要指向你的被加工面)
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