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单项选择题
A.the piston cooling oil return pipes
B.the main and crankpin bearings
C.thrust and intermediate bearings
D.stern tube and thrust bearings
单项选择题
A.the upward stroke
B.the downward stroke
C.the power stroke
D.the suction stroke
单项选择题
A.clockwise
B.anticlockwise
C.crosswise
D.vertically
单项选择题
A.transverse
B.longitudinal
C.circumferential
D.radial
单项选择题
A.micro-seizure
B.scratch
C.break
D.stick
单项选择题
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
单项选择题
A.micro-seizure
B.sticking
C.scratched
D.breakage/ollapse
单项选择题
A.micro-seizure
B.sticking
C.scratched
D.breakage/collapse
单项选择题
A.hazy light
B.hazy light brown
C.hazy light blue
D.hazy light grey
单项选择题
A.upwards;inwards
B.upwards;outwards
C.downwards;inwards
D.downwards;outwards