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。
Objective To compare the post-operative results between the patient group which used absorbable interference screw and metal interference screw during ACL reconstruction surgery.
目的膝关节镜下采用可吸收界面螺钉与金属界面螺钉重建膝关节前交叉韧带术后结果比较。
China is the world's largest producer of screw nails and bolts, while the EU is the largest consumption group.
中国是世界最大的螺丝钉和螺栓生产国，其中欧盟国家是最大消费群体。
Results: There was no significant difference of screw insertion torque and the pull-out strength between each group.
结果：各组最大螺钉旋入力矩、抗拔出力差异无统计学意义。
The experimental group were treated with dynamic hip screw (DHS) fixation, while the control group was treated with traction.
实验组采用动力髋螺钉(DHS)内固定方法治疗；对照组采用牵引治疗。
Mechanical structure is installed in a precision-guided screw device test platform, stepping motor control through the mirror group displacement to achieve CCD acquisition.
机械结构是一个安装在精密螺纹导引装置上的测试平台，通过步进电机控制反射镜组位移实现CCD采集。
Principle of dry gas seal with screw groove type was introduced. It was applied in the centrifugal compressor to realize zero gas leakage. It has safety operation of the compressor group guaranteed.
介绍螺旋槽式干气密封的工作原理，通过在离心式压缩机上应用使瓦斯达到零泄漏，保证机组的安全操作与运行。
Principle of dry gas seal with screw groove type was introduced. It was applied in the centrifugal compressor to realize zero gas leakage. It has safety operation of the compressor group guaranteed.
介绍螺旋槽式干气密封的工作原理，通过在离心式压缩机上应用使瓦斯达到零泄漏，保证机组的安全操作与运行。
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