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單項(xiàng)選擇題

測深管（）

A. sounding pipe
B. steel pipe
C. plastic pipe
D. wooden pipe

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泥箱（）

A. toolbox
B. mud box
C. medicine box
D. container box

單項(xiàng)選擇題

污水井蓋（）

A. bilge well cover
B. ballast water cover
C. fresh water cover
D. sea water well