8548| 23
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斜齿轮的跨棒距和跨球距一样吗? |
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发表于 2010-1-22 15:20
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点评
量棒与齿轮也是点接触,不是线接触!
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发表于 2010-1-22 20:32
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发表于 2010-1-23 14:35
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