单项选择题
Anchor shackles should have a breaking strength that is（）.
A.equal to the chains they are connecting B.25% more than the chains they are connecting C.50% more than the chains they are connecting D.100% more than the chains they are connecting
单项选择题 An anchor winch should be equipped with mechanical brakes capable of holding（）.
单项选择题 After deploying the anchor，a permanent chain chaser is（）.
单项选择题 A whipping on a fiber line（）.
