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變壓縮比發(fā)動(dòng)機(jī)
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奎西發(fā)動(dòng)機(jī)
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曲柄連桿機(jī)構(gòu)發(fā)動(dòng)機(jī)
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太陽(yáng)能加熱裝置
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縫紉機(jī)3
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常來(lái)哦\(^o^)/~
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