单选题If the sump（）were to rise this would indicate water leakage into the oil an d an investigation into the cause must be made.AtemperatureBviscosityCleverDlevel
单选题
If the sump（）were to rise this would indicate water leakage into the oil an d an investigation into the cause must be made.
A
temperature
B
viscosity
C
lever
D
level
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