讲弹簧机械正常的归零作用，同时要观察屏幕右上角的三角是否有反向动作。

Stresses the normal return of the mechanical spring, while the upper right corner of the screen to observe whether the triangle has a reverse action.

youdao

讲弹簧机械正常的归零作用，同时要观察屏幕右上角的三角是否有反向动作。

Stresses the normal return of the mechanical spring, while the upper right corner of the screen to observe whether the triangle has a reverse action.

youdao