单项选择题
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
Limber is a term associated with（）.A.emergency gearB.dr...
单项选择题Limber is a term associated with（）.
A.emergency gear B.drainage C.deck cargo storage D.securing gear
