单项选择题 The frequency 156.525MHZ and 156.8MHZ should be used in the band of（）.

单项选择题 Actually, the date for entry into effect will be 1st February（）.Though the text does not tell us about it.

单项选择题 The（）is that search and rescue authorities ashore, as well as shipping in the immediate vicinity of the ship in distress, will be rapidly alerted to a distress incident so they can assist in a coordinated SAR operation with the minimun delay.