Assembly tools for screws and nuts - double - headed open - ended wrenches, double - headed ring wrenches and combination wrenches - maximum widths of heads.
螺钉和螺母装配工具。双头开口扳手双头环形扳手和组合扳手。最大头部宽度。
Assembly tool for screws and nuts - open - end double - head engineers wrenches, double - head box wrenches and combination wrenches - maximum outside dimensions of heads.
螺钉和螺母装配工具。双头开口扳手双头环形扳手和组合扳手。最大头部宽度。
However, biomechanical studies are rare. Especially the impact of a combination of lateral mass and pedicle screws on stability in multilevel posterior stabilizations has not been evaluated until now.
然而，生物力学研究很少，尤其是在多节段后路的侧块和椎弓根螺钉组合的稳定性还没有研究。
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