单选题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 （）Acorrosion on the gearsBexcessive gear speedCdirt in the oilDmisalignment of the gears
单选题
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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