单项选择题
A.holds the boom down and flattens the main sail B.draws the head of the sail to windward C.tautens the standing rigging D.douses the gaff topsail
A bluff bar is a bar（）.A.extending out from a bluff alo...
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
A block and tackle is rove to advantage. This means tha...
单项选择题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
A bilge suction line，in a fishing vessel with more than...
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
