单项选择题
A.soft mud B.sand C.silt D.soft to firm clays
It is sometimes necessary to moor bow and stern to two ...
单项选择题It is sometimes necessary to moor bow and stern to two mooring buoys in order to（）.
A.avoid any swing in a restricted space B.shelter the ship from strong winds C.prevent from touching with other vessels D.make a convenience of cargo discharging
Installing tandem anchors on the same mooring line is r...
单项选择题Installing tandem anchors on the same mooring line is referred to as（）.
A.doubling B.pretensioning C.piggybacking D.paralleling
In a crossing situation，a vessel fishing must keep out ...
单项选择题In a crossing situation，a vessel fishing must keep out of the way of a vessel which is（）.
A.under sail B.towing C.restricted in her ability to maneuver D.engaged in pilotage duty
