单项选择题
COSPAS-SARSAT is intended to be used for（）.
A.distress alerting B.locating 406mhz EPIRBs C.storing distress signal D.A and B
单项选择题 Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
单项选择题 The priority of EGC messages is classified by（）.
单项选择题 The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
