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

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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. the yare not reliable
E. good to quality control
F. free of charge

选项

答案B

解析
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