单项选择题
What is the primary equipment for receiving MSI? （）
A.SART B.EPIRB C.NAVTEX D.INMARSAT-B
单项选择题 What is the MOST important thing you should do before transmitting on a marine radio? （）
单项选择题 What is a “Special Warning”? （）
单项选择题 What does a SART signal sound or look like?（）
