单项选择题
When receiving a distress alert, the SAR authorities ashore and the ships in the vicinity of the ship in distress will（）soonest.
A.reach the distress area B.conduct a sector search C.send rescue vessels D.assist coordinately in SAR operation
单项选择题 In the GMDSS, distress alerting can be transmitted in（）directions.
单项选择题 We（）the distress signal on our own radio before the shore station relayed it to us.
单项选择题 The frequency 156.525MHZ and 156.8MHZ should be used in the band of（）.
