单项选择题
The broadcast of MSI is made on two dedicated systems. “dedicated” means（）.
A.special B.different C.expensive D.valuable
单项选择题 A SART can be fixed on（）.
单项选择题 All stations which receive a distress alert shall immediately cease（）.
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.
