题目内容

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

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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

Whic one is not the machinablity characteristics?哪个不属于机械特性？

A. strength
B. hardness
C. toughness
D. denstiy

Which metals could be use to conductor wire?哪些金属可以做导线？

A. Copper
B. Aluminium
C. Lead
D. Steel