4. Which one is not the main function of detergent lubricating oil?
(A) Reducing wear of piston ring
(B) Preventing agglomeration and deposition in the engine
(C) Lowering pressure of combustion in engine
(D) Reducing wear of cylinder
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4.哪一項不是清潔劑潤滑油的主要功能？ ...
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哪一項不是清淨潤滑油的主要作用？ (...
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