单项选择题
A.Mast B.Master C.Must D.Main deck
（）are used to clean the bridge.A.RagsB.RatsC.RubbishD.D...
单项选择题（）are used to clean the bridge.
A.Rags B.Rats C.Rubbish D.Derricks
Saw dust is used to （）.A. absorb the oilB. repair the d...
单项选择题Saw dust is used to （）.
A. absorb the oil B. repair the derrick C. adjust the boom D. fill the ballast water
Spade is used to （）.A. get rid of the garbageB. fill th...
单项选择题Spade is used to （）.
A. get rid of the garbage B. fill the ballast water C. repair the derrick D. adjust the derrick
