单项选择题
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
A.RCC B.MCC C.LUT D.MRCC
单项选择题 COSPAS-SARSAT is intended to be used for（）.
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（）.
