单项选择题
A.north side of the mark B.west side of the mark C.east side of the mark D.south side of the mark
A buoy，being a shape of cylinder and with red group fla...
单项选择题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
A buoy with a composite group-flashing light indicates ...
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
A buoy marking a wreck will show a(n)（）.A.white light F...
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
