单项选择题
The concept of NAVTEX is of a（）system for the broadcast and receipt of MSI.
A.search and rescue B.safe C.co-ordinated D.hydrographic
单项选择题 The broadcast of MSI is made on two dedicated systems. “dedicated” means（）.
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（）.
