单选题Grease coatings on electrical contact surfaces increase contact resistance and should be removed with a/an （）.Asmall wire brushBcompressed air jetCclean dry clothD10% solution carbon solvent and water
单选题
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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