Low viscosity oils must have the proper API quality or the CCMC G5 designation .
低粘度机油必须具有适当的API品质或CCMCG5认证。
Conclusion : The stress on the CCMC has great relationship with the depth of canal occlusion and the movement position of cervical spine .
结论：后方致压时，颈脊膜脊髓所受压力与致压深度及颈脊柱运动有着密切联系。
ccmc