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單項選擇題

（）are used to clean the bridge.

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

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Saw dust is used to （）.

A. absorb the oil
B. repair the derrick
C. adjust the boom
D. fill the ballast water

單項選擇題

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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