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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
单项选择题
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
单项选择题
A.disengaged
B.engaged
C.assembled
D.disassembled