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 4 ______

【参考答案】

D
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