填空题
- A. Langmir and Schaefer’s work for the GE Company
- B. Langmir and Schaefer’s discovery of rain-forming
- C. Men’s knowledge of rain-formingE. Schaefer’s discovery by accident
- D. Schaefer’s several unsuccessful experimentsF. Langmir and Schaefer’s successful cooperation
Paragraph 6 ______
【参考答案】
E