What category of materials were likely the first man-made materials?:
A: Copper Alloys
B: Ceramics
C: Composites
D: Concrete
E: Semiconductors
A: Copper Alloys
B: Ceramics
C: Composites
D: Concrete
E: Semiconductors
举一反三
- Consider a cement wall reinforced with steel bars. Into which category of materials would you place reinforced concrete? A: Metals B: Non Metals C: Composites D: Ceramics
- According to source, composite materials divided into: （） A: conductive composite materials B: natural composite materials C: artificial composite materials D: damping composites
- The term processing refers to how materials are made from naturally occurring or man-made chemical.
- Composite materials have been in existence for many centuries. The earliest man-made composite materials were straw and mud combined to form bricks for building construction.。（ ）
- 3.3The following materials are widely used in high power machines except for . A: Unalloyed iron B: Nd2Fe14B permanent magnetic materials C: Aluminum-iron alloys D: Silicon-iron