單項(xiàng)選擇題Just after stopping the engine while the oil is still circulating.Check that uniform oil jets appear from all the oil outlet grooves in the crosshead bearing lower shell and the guide shoes.The oil flow from （） must be compared from unit; there should be a similarity in the flow patterns.

A.the piston cooling oil return pipes
B.the main and crankpin bearings
C.thrust and intermediate bearings
D.stern tube and thrust bearings


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1.單項(xiàng)選擇題The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass the lubricating orifices during （）

A.the upward stroke
B.the downward stroke
C.the power stroke
D.the suction stroke

5.單項(xiàng)選擇題Broken piston rings manifest themselves during the scavenge port inspection by（）

A.Lack of elastic tension, when the rings are pressed into the groove by means of a stick
B.Blackish appearance
C.Fractured rings and missing rings
D.all off the above