Chinese foreign minister hosts Spanish counterpart

The video provides a brief overview of solid steel doors and diamonds, highlighting their properties and uses. It serves as an introduction to these materials, focusing on their significance and applications.

What is a key feature of solid steel doors that makes them popular for security purposes?

• Lightweight structure

• High durability

• Transparent design

• Flexible material

Solid steel doors are primarily used for which of the following purposes?

• Soundproofing

• Decoration

• Security

• Insulation

Which of the following is a common use for diamonds?

• Construction material

• Fuel

• Insulation

• Jewelry

What property of diamonds makes them valuable in industrial applications?

• Conductivity

• Flexibility

• Hardness

• Softness

Which material is known for its exceptional hardness and is often used in cutting tools?

• Copper

• Diamond

• Silver

• Gold