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1. |
What is the frequency range of radio frequency(RF)? |
A. | 20 KHz to 300 GHz |
B. | 2 KHz to 30 GHz |
C. | 200 KHz to 3000 GHz |
D. | 10 KHz to 10 GHz |
Answer» B. 2 KHz to 30 GHz | |