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:
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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
教育康复实施的途径,通常包括人才培养模式的改革、特校课程改革、____________。