Grease coatings on electrical contact surfaces increase contact resistance and should be removed with a/an （）.<br>A:small wire brush<br>B:compressed air jet<br>C:clean dry cloth<br>D:10% solution carbon solvent and water

Grease coatings on electrical contact surfaces increase contact resistance and should be removed with a/an （）.
A:small wire brush
B:compressed air jet
C:clean dry cloth
D:10% solution carbon solvent and water

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