单项选择题
A cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water in the area is on the（）.
A.north side of the mark
B.west side of the mark
C.east side of the mark
D.south side of the mark
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A buoy，being a shape of cylinder and with red group flashing，shows that it is（）.
A.left-side buoy
B.right-side buoy
C.a buoy of safety
D.a buoy of danger -
单项选择题
A buoy with a composite group-flashing light indicates a(n)（）.
A.anchorage area
B.fish net area
C.bifurcation
D.dredging area -
单项选择题
A buoy marking a wreck will show a(n)（）.
A.white light FL (2) and a topmark of 2 black spheres
B.occulting green light and may be lettered
C.yellow light and will be numbered
D.continuous quick white light and may be numbered
