其特征是在固定中轴沿固定中轴的轴线在中轴的顶端制出若干个薄的翼片。
The utility model is characterized in that the top of the center shaft is provided with a plurality of thin wing pieces in the axes direction of the center shaft.
其特征是在固定中轴沿固定中轴的轴线在中轴的顶端制出若干个薄的翼片。
The utility model is characterized in that the top of the center shaft is provided with a plurality of thin wing pieces in the axes direction of the center shaft.
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