化学
Nanotechnology
1.What does the professor mainly discuss?
- A. The design of mechanical vehicles on a microscopic scale.
- B. The use of modified bacteria to power microscopic machines.
- C. Ways that nanotechnology has been used in medical treatment.
- D. How none-machines are being used to study biological processes.
2.What components of a none-car does the professor say present the greatest challenge to researches? Click on 2 answers
- A. A barking mechanism
- B. Wheels
- C. An engine
- D. A steering mechanism
3.Why does the professor mention honey?
- A. To help illustrate the difficulty of moving nano-vehicles through water or air.
- B. To explain why fluids like water have greater density than air.
- C. To indicate a surprisingly useful source of energy for nano-vehicles.
- D. To make a comparison between insect movement and the movement of none-vehicles.
4.What was responsible for the successful movement to the platinum-gold rod nano-engine?
- A. Hydrogen peroxide destroyed bacteria cells blocking the engine’s paths.
- B. The combination of two chemical reactions created a proton imbalance.
- C. Interactions between the platinum and gold cost the rod to spin quickly.
- D. The magnetic field that surrounded the engine was destabilized.
5.Why does the nano-engine that the professor discusses not need to carry fuel?
- A. The machine is pushed forward by air or water pressure.
- B. The machine is powered externally by rotating magnets.
- C. The carbon wheels on the machine rotate freely on their own.
- D. The liquid in which the machine is immersed is fuel supply.
6.What is the professor’s attitude about the use of magnetic fields for steering nano-vehicles?
- A. It has the advantage of allowing nano-vehicles to steer themselves independently.
- B. It is an effective approach but other approaches are needed as well.
- C. It is a prone steering method but decreases engine efficiency.
- D. It has been the most difficult challenge so far in the development of nano-vehicles.
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