单选题In engines with system, the lubricating oil can be added to the engine through the filling hole in the crankcase cover, by using a hand oil can, or through the separator pipe（）Alubricating oilBdry sumpCcirculated tankDwet sump
单选题
In engines with system, the lubricating oil can be added to the engine through the filling hole in the crankcase cover, by using a hand oil can, or through the separator pipe（）
A
lubricating oil
B
dry sump
C
circulated tank
D
wet sump
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