878| 6
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求解一下德國(guó)標(biāo)準(zhǔn)的 中心孔 |
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點(diǎn)評(píng)
DIN 332-2
不對(duì),DR M20根本不在這個(gè)德標(biāo)規(guī)定的標(biāo)注方法范疇內(nèi)。
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