A、take the wear should the towline drag bottom
B、assure that if the towline is overstressed it will part close to the bridle
C、prevent the towline from whipping should it part
D、put spring in the towline
更多“Tugs sometimes shackle a length of chain in the towline in order to（）.”相关的问题
A、always move slowly B、are in one place only C、sometime move sometime don‟t move D、are synchronizing with the movement of the earth
A、A.always move slowly B、B.are in one place only C、C.sometimes move and sometime don‟t D、D.synchronize with the movement of the earth
A、steerageway is not taken off B、the bow doesn't close the dock first C、the bow closes the dock first D、the ship has no headway at the time
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