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

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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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