减小了衔接部位，减少零部件，简化了组装工序，增强稳定性，延长使用寿命，可降低成本。
The linking places are reduced, the components are reduced, and the assembling procedure is simplified. The stability is enhanced, and the service life is prolonged. The cost can be reduced.
减小了衔接部位，减少零部件，简化了组装工序，增强稳定性，延长使用寿命，可降低成本。
The linking places are reduced, the components are reduced, and the assembling procedure is simplified. The stability is enhanced, and the service life is prolonged. The cost can be reduced.
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