单项选择题

（）are used to clean the bridge.

A.Rags
B.Rats
C.Rubbish
D.Derricks

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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
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
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