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
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（）.
单项选择题 A “spring line” is（）.
