19.Which device is used in a diesel engine to inject a metered quantity of lubricating oil into the cylinder as the piston ring pack passes the injection points?
(A) Lubricator
(B)Camshaft
(C)Crosshead
(D)Piston rod

答案：登入後查看
統計： A(73), B(8), C(18), D(5), E(0) #1220403