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
查看答案
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
Non-metallic materials include：非金属材料包括：
A. Fiber
B. Plastic
C. Nylon
D. Zinc
The following material can be made into shaft:下面的材料能够加工成轴
A. Mild steel
B. Alloy steel
Cast iron
D. 45
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