单项选择题
A vessel continually lists to one side and has a normal rolling period. Which statement is TRUE?（）.
A.The vessel has negative GM
B.The center of gravity is on the centerline
C.The list can be corrected by reducing KM
D.The vessel has asymmetrical weight distribution
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A vessel constrained by her draught may，in addition to the lights prescribed for power-driven vessels in Rule 23，exhibit where they can best be seen（）or a cylinder.
A.two all-round red lights in a vertical line
B.three all-round red lights in a vertical line
C.two all-round yellow lights in a vertical line
D.three all-round green lights in a vertical line -
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A vessel conducting mine clearing operations will show（）.
A.three balls in a vertical line
B.two balls in a vertical line
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A vessel being towed will show（）.
A.a forward masthead light
B.sidelights and a sternlight
C.a towing light
D.All of the above
