The expandable nail offers the theoretical advantages of improved load sharing and rotationalcontrol without the need for interlocking screws.
可膨胀髓内钉提供了改善负荷的理想优势，而且不需锁定既可控制旋转。
2
There is no need to control the rotational position about the axis of the bore, because up to the time when the holes are drilled, it is symmetrical about that axis.
由于直至钻这些小孔时，工件都对称于大孔轴线，所以没必要控制围绕大孔轴线回转的位置。
3
This system can complete the engine rotational speed and torque high accuracy control and the test, also engine temperature, pressure, oil consumption parameters survey.