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M12和M20長(zhǎng)螺桿的加工,,大概多少錢一個(gè),,600件,、700件 |
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點(diǎn)評(píng)
難度不在螺紋,,在你凹進(jìn)去的鏤空的部位,這么長(zhǎng)怎么車
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