4627| 3
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化肥包裝袋的最后封口時(shí),那個(gè)線是怎么交叉縫的---請(qǐng)教 |
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點(diǎn)評(píng)
你在網(wǎng)上找找看,我估計(jì)有,挺簡(jiǎn)單的,你自己找個(gè)線,做兩個(gè)套,前套反套后套,一下就明白了,哈哈,
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