单选题Lubricating oil should be changed on a heavy duty diesel engine when（）.Ait gets dark in colorBa sample rubbed between fingers feels thinCit has been in use for a specified intervalDit no longer supports combustion
单选题
Lubricating oil should be changed on a heavy duty diesel engine when（）.
A
it gets dark in color
B
a sample rubbed between fingers feels thin
C
it has been in use for a specified interval
D
it no longer supports combustion
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