The frequency 156.525MHZ and 156.8MHZ should be used in the band of（）.
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NAVTEX使用的频率为（） 1）518KHZ 2）156.8MHZ 3）490KHZ 4）4209.5KHZ 5）156.525MHZ 6）2182KHZ
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MF/HFDSC值守必须值守的频率是（） 1）156.525MHZ 2）2187.5KHZ 3）4207.5KHZ 4）8414.5KHZ 5）16804.5KHZ 6）12577KHZ
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MF£¯HFDSC值守必须值守的频率是（)。1)156.525MHZ2)2187.5KHZ3)4207.5KHZ4)8414.5KHZ5)16804.5KHZ6)12577KHZ
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