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Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with _______.
A.excessive speed
B.improper warm-up
C.extreme misalignment
D.inadequate lubrication
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单选题Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with （）A
excessive speedB
improper warm-upC
extreme misalignmentD
inadequate lubrication
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excessive gear speedC
dirt in the oilD
misalignment of the gears
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