轴承工作（）后应更换新的润滑脂，但每年不得少于一次。

答案查看网，轻松搜题/搜资源

【单选题】【消耗次数：1】

① 500~1000h

② 1000~1200h

③ 2000~2500h

④ 2500~3000h

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