樓主: 氣壓機(jī)
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標(biāo)準(zhǔn)麻花鉆的角度為啥是118度,? |
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點(diǎn)評(píng)
zhetao這套理論是哪里來的呢,? 該如何理解呢,? 有什么實(shí)驗(yàn)數(shù)據(jù) 作為支持呢?
請(qǐng)賜教
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