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單項選擇題

I was told not to use （）in handling bagged cargoes.

A.blocks
B.hooks
C.cargo sling
D.derricks

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單項選擇題

Before opening the hatch covers, all cleats are to be （）.

A. released
B. secured
C. taken away
D. sent out

單項選擇題

A （）is used for lifting long heavy cargo.

A.derrick
B.crane
C.jumbo boom
D.boom