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Replace timely worn or damaged electric brush. Remove timely dusts, small pieces and etc.
应及时更换已磨损到位的电刷，及时清除机器灰尘、杂物等。
The application of orthogonal design method in the research of the electric brush was introduced.
介绍了正交设计在电刷研制中的应用。
Repair or replace the electric brush; clean the commutator surface by abrasive paper and blow it clean.
修理或调换电刷，用木砂纸清理整流子表面，并吹净。
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