Pitting in the area close to the pitch line and on the same end of each gear tooth of a reduction gear unit would be caused by （）<br>A:corrosion on the gears<br>B:excessive gear speed<br>C:dirt in the oil<br>D:misalignment of the gears

Pitting in the area close to the pitch line and on the same end of each gear tooth of a reduction gear unit would be caused by （）
A:corrosion on the gears
B:excessive gear speed
C:dirt in the oil
D:misalignment of the gears

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