题目内容

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

A. Iron
Brass
C. PVC
D. Alloy

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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

Some elements are good for making steel stronger and tougher , they are:有些元素有利于增强钢的强度和韧性，是：

A. S
B. Mn
C. Si
D. P

The commonprocessmethods of material forming include :常见的材料加工方法包括：

A. bending
B. cutting
C. grinding
D. milling