2448| 2
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請(qǐng)教 關(guān)于QT500-7 |
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點(diǎn)評(píng)
感謝大俠耐心解讀,,又增長(zhǎng)了見(jiàn)識(shí)
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點(diǎn)評(píng)
安全系數(shù)可以取3吧
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