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当前学科:货车检车员高级工
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滚动轴承外观检查外溢、变色油脂时,若发现轴承温度偏高,油脂呈黑灰色,手捻油脂有颗粒状感觉即为轴承内部()。
A . A、混砂
B . B、混水
C . C、混金属粉末
D . D、混油
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