Cast iron can be used to make?铸铁可以制作?
A. gates
B. railing
C. engines
D. medical instruments
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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
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