3888| 8
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圖示定滑輪其標稱直徑是指輪緣,還是中間 |
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點評
指兩端的直徑。
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本版積分規(guī)則
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Archiver|手機版|小黑屋|機械社區(qū) ( 京ICP備10217105號-1,京ICP證050210號,浙公網(wǎng)安備33038202004372號 )
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