2502| 11
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不花您5毛錢,只需您5分鐘,,快速了解沉孔標(biāo)注與解釋,,還愁啥? |
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點(diǎn)評(píng)
是GB不是JB, GB/T4458.4,,GB/T16675.2與ASME14.5.
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點(diǎn)評(píng)
機(jī)械群里高手如云
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