1405| 6
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求助:鏈輪轉(zhuǎn)一圈的周長(zhǎng)是齒數(shù)*節(jié)距還是分度圓*π? |
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小黑屋|手機(jī)版|Archiver|機(jī)械社區(qū) ( 京ICP備10217105號(hào)-1,京ICP證050210號(hào),浙公網(wǎng)安備33038202004372號(hào) )
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