The inside of the sleeve is shaped to match the cross section of the tube (12) and the outside has a non-circular shape.
套筒的内部被成形为与管子(12)的横截面相符合并且其外面具有非圆形形状。
The inside of the sleeve is shaped to match the cross section of the tube (12) and the outside has a non-circular shape.
套筒的内部被成形为与管子(12)的横截面相符合并且其外面具有非圆形形状。
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