问题
单项选择题
Boilers and cylinders are（）.
A.raw metallic products
B.finished metallic products
C.consumable products
D.Manufactured goods of large Size
答案
参考答案：D
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Boilers and cylinders are（）.
A.raw metallic products
B.finished metallic products
C.consumable products
D.Manufactured goods of large Size
参考答案：D