A.one black ballB.two cones with bases togetherC.a cone……

单项选择题A vessel enagaged in fishing，and at anchor，shall show（）.

A.an anchor light
B.sidelights and a sternlight
C.three lights in a vertical line，the highest and lowest being red，and the middle being white
D.None of the above

单项选择题A vessel crossing a river on the Western Rivers has the right of way over（）.

A.vessels ascending the river
B.vessels descending the river
C.all vessels ascending and descending the river
D.None of the above

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

单项选择题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

单项选择题A vessel conducting mine clearing operations will show（）.

A.three balls in a vertical line
B.two balls in a vertical line
C.one ball near the foremast and one ball at each fore yard
D.one diamond near the foremast head and one ball at each fore yard