If you own a newer vehicle, like the ones shown here, chances are that the head unit is not easily replaced due to cosmetic or functional concerns.
如果你有一辆新车，如图所示，要更换汽车音响机头单元的话会有点困难，因为要考虑到美观和性能因素。
Besides, the guide head unit having crosswise grooves can be used in welding circular pipes.
此外，具有多个横向槽的导向头单元可用于对实际上为圆形的管子进行焊接。
Besides, the guide head unit having crosswise grooves can be used in welding circular pipes.
此外，具有多个横向槽的导向头单元可用于对实际上为圆形的管子进行焊接。
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