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
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A.micro-seizure
B.sticking
C.scratched
D.breakage/ollapse
A.micro-seizure
B.sticking
C.scratched
D.breakage/collapse
A.hazy light
B.hazy light brown
C.hazy light blue
D.hazy light grey
A.upwards；inwards
B.upwards；outwards
C.downwards；inwards
D.downwards；outwards
A.at the first stop after a long voyage egby anchoring if possible
B.at the first stop after arrival at harbor
C.at the first stop after low load running
D.at the first stop after passing river or canal passage
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