VFR飞行和IFR飞行之间应当配备哪种间隔？（What type of separations shall apply between VFR flights and IFR flights?）
VFR飞行和IFR飞行之间应当配备哪种间隔？（What type of separations shall apply between VFR flights and IFR flights?）
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VFR飞行和IFR飞行之间应当配备哪种间隔？（What type of separations shall apply between VFR flights and IFR flights?）