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單項選擇題

We use TEU as the unit of the standard containers. Its length is（）.

A.40ft
B.20ft
C.20m
D.40m

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單項選擇題

The safe working load of the derrick is （）.

A.5 tons
B.5 metres
C.5 feet
D.5 mile

單項選擇題

Close the （）, please.

A. hatch coamings
B. hatch covers
C. hatch beams
D. hatch openings