单项选择题
A buoy with a composite group-flashing light indicates a(n)（）.
A.bifurcation B.fish net area C.anchorage area D.dredging area
单项选择题 A block and tackle is “rove to advantage”. This means that the（）.
单项选择题 A ballasted vessel sinks enroute to a dry dock. Under these circumstances，the vessel’s owner can claim（）.
单项选择题 A backlash below a lock is defined as a（）.
