A.a line is weakened by constantly pulling on it in one direction
B.normal wear on the line is thus distributed to different areas
C.it prevents the line from kinking or unlaying
D.it prevents permanent misalignment of the line's internal strands
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（）is the act of allocating space to containers on board of a container ship in the order of the discharge ports.
When the wave period and the apparent rolling period are the same（）.