8189| 26
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请教齿轮传动 |
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点评
弹簧在拉伸过程中不就变成负载了吗?
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发表于 2020-4-4 19:47:43
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发表于 2020-4-4 20:02:44
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发表于 2020-4-4 20:05:40
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