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802.11帧结构中，有几个address？（）
- A、2
- B、3
- C、4
- D、5
参考答案
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Which of the following is true about an IP address if the first bit is a zero?（）A、The address is a Class A address.B、The address is a Class B address.C、The address is a Class C address.D、The address is a Class D address.
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