填空题

  • A. Study of Sound
  • B. Highway Police
  • C. Working Principles
  • D. Early Use of" Radar"
  • E. Useful Tools
  • F. Discovery by Chance

Paragraph 4 ______.

【参考答案】

C
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填空题
F
单项选择题
Where has the software been available prior to release a beta version
A．Canada.
B．Israel.
C．German.
D．Japan.
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