单项选择题
You must（）your cable from 6 shackles to 3 shackles.
A.cut B.pay out C.slack D.shorten
单项选择题 You must rig gangway combined（）pilot ladder.
单项选择题 You must rig pilot ladder（）port side.
单项选择题 Your（）is 175 degrees from the lighthouse.
