15. Which feature is indicated by a gradually rising pressure in the crankcase of trunk piston diesel engines?
(A)Crankshaft wearing
(B)Blow-by
(C)Water leakage
(D)Fuel dilution
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統計: A(0), B(2), C(0), D(0), E(0) #4067960
統計: A(0), B(2), C(0), D(0), E(0) #4067960