方法对下颈椎不稳症21例均采用正侧双斜位及摄X线动态颈椎侧位过曲过伸片。
Methods X-ray posteroanterior, lateral, double-oblique and dynamic lateral overflexional and overextensive views were performed on 21 patients.
我们已经研究了分别具椭圆和双曲不动点的二维保测度映射及其受摄三维扩张的KS熵。
We have studied the KS entropy of a 2-dimensional measure-preserving mapping with an elliptic or hyperbolic fixed point respectively, as well as that of its 3-dimensional extension.
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