北面标志钥匙链
Onshape 文档： https://cad.onshape.com/documents/8ca4b6e9bc3ba3c30938e26e/w/f6b991e0bf0fefe70a510a39/e/a7304ef4aabee93a3d281634?renderMode=1&uiState=65bea85e9db99706ea03460d
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