单项选择题
The safe working load of each derrick is five （）.
A.tones
B.tonnages
C.tons
D.dunnage
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All the （）in hold No.3 should be bagged.
A.sweep
B.sweeping
C.sweepings
D.dunnage -
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I was told not to use （）in handling bagged cargoes.
A.blocks
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D.derricks -
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Before opening the hatch covers, all cleats are to be （）.
A. released
B. secured
C. taken away
D. sent out
