Low-frequency RFID systems have short transmission ranges.
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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
When activated, the antenna transmits data back to the tag.
A. 对
B. 错
高分子溶液剂的影响因素不包含（ ）
A. 药物的溶解过程
B. 高分子药物的粉碎度
C. 电荷的影响
D. 颜色的影响
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