阿摩線上測驗
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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統計： A(64), B(121), C(569), D(58), E(0) #1444927
統計： A(64), B(121), C(569), D(58), E(0) #1444927
