题目内容

E-mail 地址中用户名和邮件所在服务器名之间的分隔符号是( )

A.
B. @
C. $
D. &

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Metal are classified into two categories, ferrous and non-ferrous,which one is non-ferrous?金属被分为两类，黑色金属和有色金属，下列哪个是有色金属？

A. Copper
B. Mild steel
C. Stainless steel
D. High carbon steel

Which one is used to manufacture cutting tools, such as drills?下列哪种材料可以用于制作刀具，例如钻头？

A. mild steel
B. high carbon steel
C. stainless steel
D. cast iron

Cast iron can be used to make？铸铁可以制作？

A. gates
B. railing
C. engines
D. medical instruments

Which material is nonmetallic?哪种材料是非金属？

A. Iron
Brass
C. PVC
D. Alloy