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
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A block and tackle is “rove to advantage”. This means that the（）.
A.blocks have been overhauled
B.hauling parts of two tackles are attached
C.hauling part leads through the movable block
D.hauling part leads through the standing block -
单项选择题
A ballasted vessel sinks enroute to a dry dock. Under these circumstances，the vessel’s owner can claim（）.
A.actual total loss
B.constructive total loss
C.general average
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A backlash below a lock is defined as a（）.
A.current setting your vessel on the wall
B.current setting into the lock chamber
C.an eddy working along the lower guide wall
D.current setting counterclockwise
