Primitively, slash and burn technology brought only poor harvests, which urged Emperor Yan to improve sowing and planting methods.
A: 对
B: 错
A: 对
B: 错
举一反三
- Primitively, slash and burn technology brought only poor harvests, which urged Emperor Yan to improve sowing and planting methods. A: 对 B: 错
- Which of the following methods can eliminate system errors? A: Calibrate measuring instruments. B: Improve measurement methods. C: Change the test temperature. D: Run a controlled experiment.
- There are many calculation methods for petroleum reserves in reservoirs, which can be roughly divided into static methods and dynamic methods.
- In production, the main sowing methods are (). A: A.broadcast B: B.drill sowing C: C.hole sowing D: D.precision sowing
- According to Richard Tomkins, which is not the fact that technology brought to us?