Which of the following is an advantage of glass lenses?
A: Good hardness
B: Good heat resistance
C: Light
D: Thin
E: Good impact resistance
A: Good hardness
B: Good heat resistance
C: Light
D: Thin
E: Good impact resistance
举一反三
- Which of the following is not the reason why concrete needs reinforcement? A: Reinforcement has good tensile resistance, while concrete has good compressive resistance. B: Reinforcement has good compressive resistance as concrete. C: Engineers prefer ductile failure to brittle failure of the members. D: Reinforcement and concrete can work together to increase the bearing capacity of the members.
- Due to its good heat resistance ,when cutting with carbide tools, generally do not add cutting fluid
- The hardness, wear resistance and heat resistance of cemented carbide are higher than that of high-speed steel.
- The advantages of cotton include: A: high level of moisture absorption B: moderate strength ,good abrasion resistance •and good dimensional stability C: resists sunlight and heat well D: soft hand feel
- Which of the following are characteristics of the steel structure? A: High strength and low weight B: Good plasticity and toughness C: Easy to manufacture and construct D: Weak corrosion resistance