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單項(xiàng)選擇題

You （）use hooks when discharging bagged cargo.

A.should
B.shouldn’t
C.must
D.can

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單項(xiàng)選擇題

A little （）may cause great damage or loss.

A.care
B.careless
C.carelessness
D.careful

單項(xiàng)選擇題

Never operate hatch covers when the ship is（）.

A. in port
B. anchoring
C. rolling or pitching
D. at sea

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