14665| 10
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請問中國造圓珠筆芯鋼珠的技術(shù)如何,都有哪些技術(shù)難點? |
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點評
CCTV 2有過這個專題,圓珠筆什么的,可以到網(wǎng)上看看
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點評
見6樓的鏈接,不一定準(zhǔn)確,老資料了
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