2. 外语
  3. A. Ongoing Research B. Extension of Use C. Robot Heroes D. Greater Reliability E. Falling Demand F. Hidden Danger A. too much

A. Ongoing Research B. Extension of Use C. Robot Heroes D. Greater Reliability E. Falling Demand F. Hidden Danger A. too much

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问题 A. Ongoing Research
B. Extension of Use
C. Robot Heroes
D. Greater Reliability
E. Falling Demand
F. Hidden Danger
A. too much energy
B. based on American designs
C. they are too costly
D. they are not reliable
E. good to quality control
F. free of charge
选项
答案B
解析
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