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單項選擇題

Boilers and cylinders are（）.

A.raw metallic products
B.finished metallic products
C.consumable products
D.Manufactured goods of large Size

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單項選擇題

Tools and instruments belong to（）.

A.raw materials
B.consumable products
C.finished metalic products
D.raw metallic products

單項選擇題

When loading or unloading baled cargo on board,the straps（）to lift or drag the bales.

A.are forbidden
B.are allowed
C.can be used
D.are usually used

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