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In engines with system the lubricating oil can be added to the engine through the filling

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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

请帮忙给出正确答案和分析，谢谢！

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