以下哪一个是SDN的关键技术：（）。 A: OpenFlow B: OpenAir C: AirForce D: AirMax
以下哪一个是SDN的关键技术：（）。 A: OpenFlow B: OpenAir C: AirForce D: AirMax
During the war he had tried to ______ in the Royal AirForce, giving his age as eighteen, but had been refused.
During the war he had tried to ______ in the Royal AirForce, giving his age as eighteen, but had been refused.
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