Rubber boot must have double groove on lip and not single as per your sample.

胶靴启动槽上必须有双重唇而不是单一的按你的样品。

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Double row deep groove ball bearings are very sensitive to misalignment.

双列深沟球轴承是非常敏感不对。

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Double row deep groove ball bearings are very sensitive to misalignment.

双列深沟球轴承是非常敏感不对。

youdao