A linear independent general criterion of hybrid screw group was deduced based on the matrix transform theory of linear algebra.
采用线性代数的矩阵变换理论，推导出混合螺旋系线性相关性的一般性判据。
Rotary compressor has adopt a group of screw, will certain volume of air compressor become smaller pressure higher air, until the system to achieve need pressure.
旋转式压缩机采用了一组螺杆，将一定体积的空气压缩成为体积更小压力更高的空气，直至系统达到所需要的压力。
Under the same axial compression load, the dislocation of the pedicle screw in AFC group was apparently less than that in fixation group.
在相同轴向压缩载荷作用下，AFC组椎弓根钉受力移位较内固定组明显减小。
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