267 一般活塞環槽端面磨損率小於多少為正常磨損?
(A)0.01 mm/khrs
(B)0.02mm/khrs
(C)0.03 mm/khrs
(D)0.04 mm/khrs

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統計： A(32), B(8), C(3), D(2), E(0) #1307988