以改革创新为核心的时代精神，是当代中国人民精神风貌的集中写照，是激发社会创造活力的强大力量。
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Low-frequency RFID systems have short transmission ranges.
A. 对
B. 错
In general, the lower the frequency, the more expensive the system.
A. 对
B. 错
High-frequency RFID systems offer short transmission ranges.
A. 对
B. 错
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