There should be no exposed screw heads.
螺钉头不应暴露在外。
Three-dimensional isothermal material flows in the metering section of injection molder with different screw heads during injection molding are simulated through POLYFLOW software.
针对头部无螺纹和有螺纹的注塑螺杆，使用POLYFLOW软件数值模拟了注塑机螺杆计量段熔料在注射过程中的三维等温流场。
Objective:To investigate the effect of femoral intertrochanteric fracture in elderly patients treated with the double heads compressive hollow screw.
目的：探讨双头加压空心螺钉在老年股骨粗隆间骨折中的应用价值。
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