单项选择题
A bluff bar is a bar（）.
A.extending out from a bluff alongside the river
B.that tends to give a false indication of its position
C.that has a sharp drop off into deep water
D.that is perpendicular to the current
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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 bilge suction line，in a fishing vessel with more than 16 individuals aboard，must have a strainer with an open area not less than how many times the open area of the suction line?（）
A.one
B.two
C.three
D.four -
单项选择题
Limber is a term associated with（）.
A.emergency gear
B.drainage
C.deck cargo storage
D.securing gear
